In some animals Animals are a major group of mostly multicellular, eukaryotic organisms of the kingdom Animalia or Metazoa. Their body plan eventually becomes fixed as they develop, although some undergo a process of metamorphosis later on in their life. Most animals are motile, meaning they can move spontaneously and independently. All animals are also, including vertebrates Vertebrates are members of the subphylum Vertebrata, chordates with backbones or spinal columns. About 58,000 species of vertebrates have been described. Vertebrata is the largest subphylum of chordates, and contains many familiar groups of large land animals. Vertebrates comprise cyclostomes, bony fish, sharks and rays, amphibians, reptiles,, echinoderms Echinoderms are a phylum of marine animals. Echinoderms are found at every ocean depth, from the intertidal zone to the abyssal zone. Aside from the problematic Arkarua, the first definitive members of the phylum appeared near the start of the Cambrian period, insects Insects are a class within the arthropods that have a chitinous exoskeleton, a three-part body (head, thorax, and abdomen), three pairs of jointed legs, compound eyes, and two antennae. They are among the most diverse group of animals on the planet and include more than a million described species and represent more than half of all known living (mid-gut) and molluscs The Mollusca, common name molluscs or mollusks,[note 1] is a large phylum of invertebrate animals. There are around 85,000 recognized extant species of molluscs. This is the largest marine phylum, comprising about 23% of all the named marine organisms. Numerous molluscs also live in freshwater and terrestrial habitats. Molluscs are highly diverse,, the stomach is a muscular Muscle is the contractile tissue of animals and is derived from the mesodermal layer of embryonic germ cells. Muscle cells contain contractile filaments that move past each other and change the size of the cell. They are classified as skeletal, cardiac, or smooth muscles. Their function is to produce force and cause motion. Muscles can cause, hollow, dilated part of the alimentary canal The Human gastrointestinal tract is the system by which ingested food is acted upon by physical and chemical means to provide the body with nutrients it can absorb and to excrete waste products; in mammals the system includes the alimentary canal extending from the mouth to the anus, and the hormones and enzymes assisting in digestion which functions as the primary organ In biology and anatomy, an organ is a collection of tissues joined in structural unit to serve a common function of the digestive tract. It is involved in the second phase of digestion In mammals, food enters the mouth, being chewed by teeth, with chemical processing beginning with chemicals in the saliva from the salivary glands. Then it travels down the esophagus into the stomach, where hydrochloric acid kills most contaminating microorganisms and begins mechanical break down of some food , and chemical alteration of some. The, following mastication Mastication or chewing is the process by which food is crushed and ground by teeth. It is the first step of digestion and it increases the surface area of foods to allow more efficient break down by enzymes. During the mastication process, the food is positioned between the teeth for grinding by the cheek and tongue. As chewing continues, the food (chewing). The stomach is located between the esophagus The esophagus or oesophagus , sometimes known as the gullet, is an organ in vertebrates which consists of a muscular tube through which food passes from the pharynx to the stomach. The word esophagus is derived from the Latin œsophagus, which derives from the Greek word oisophagos , lit. "entrance for eating." In humans the esophagus is and the small intestine In vertebrates, the small intestine is the part of the gastrointestinal tract following the stomach and followed by the large intestine, and is where the vast majority of digestion and absorption of food takes place. In invertebrates such as worms, the terms "gastrointestinal tract" and "large intestine" are often used to. It secretes protein-digesting enzymes Enzymes are proteins that catalyze chemical reactions. In enzymatic reactions, the molecules at the beginning of the process are called substrates, and the enzyme converts them into different molecules, called the products. Almost all processes in a biological cell need enzymes to occur at significant rates. Since enzymes are selective for their and strong acids to aid in food digestion, (sent to it via oesophageal The esophagus or oesophagus , sometimes known as the gullet, is an organ in vertebrates which consists of a muscular tube through which food passes from the pharynx to the stomach. The word esophagus is derived from the Latin œsophagus, which derives from the Greek word oisophagos , lit. "entrance for eating." In humans the esophagus is peristalsis Peristalsis is a radially symmetrical contraction of muscles which propagates in a wave down the muscular tube. In humans, peristalsis is found in the contraction of smooth muscles to propel contents through the digestive tract. Earthworms use a similar mechanism to drive their locomotion. The word is derived from New Latin and comes from the) through smooth Smooth muscle is an involuntary non-striated muscle. It is divided into two sub-groups; the single-unit and multiunit smooth muscle. Within single-unit smooth muscle tissues, the autonomic nervous system innervates a single cell within a sheet or bundle and the action potential is propagated by gap junctions to neighboring cells such that the muscular contortions (called segmentation) before sending partially-digested food (chyme) to the small intestines.

The word stomach is derived from the Latin Latin or sometimes Roman is an Italic language originally spoken in Latium and Ancient Rome. Although often considered a dead language, in view of the fact that it has no native, fluent speakers, Latin continues to be taught in schools and has been, and currently is, used in the process of new word production in modern languages from many stomachus which is derived from the Greek Greek , an independent branch of the Indo-European family of languages, is the language of the Greeks. Native to the southern Balkans, it has the longest documented history of any Indo-European language, spanning 34 centuries of written records. In its ancient form, it is the language of classical ancient Greek literature and the New Testament of word stomachos, ultimately from stoma (στόμα), "mouth". The words gastro- and gastric (meaning related to the stomach) are both derived from the Greek word gaster (γαστήρ).

Even amoeba Amoeba is a genus of protozoan and carnivourous plants have structures which are analogous to the stomach.

Contents 1 Role in Digestion 2 Anatomy of the Stomach 2.1 Sections 2.2 Blood supply 2.3 Glands 3 Control of secretion and motility 4 EGF in gastric defense 5 Stomach as nutrition sensor 6 Diseases of the stomach 7 In other animals 8 See also 9 References 10 External links

Role in Digestion

Bolus (masticated food) enters the stomach through the esophagus The esophagus or oesophagus , sometimes known as the gullet, is an organ in vertebrates which consists of a muscular tube through which food passes from the pharynx to the stomach. The word esophagus is derived from the Latin œsophagus, which derives from the Greek word oisophagos , lit. "entrance for eating." In humans the esophagus is via the esophageal sphincter. The stomach releases proteases A protease breaks down proteins. A protease is any enzyme that conducts proteolysis, that is, begins protein catabolism by hydrolysis of the peptide bonds that link amino acids together in the polypeptide chain forming the protein. Proteases work best in acidic conditions (protein-digesting enzymes such as pepsin Pepsin is an enzyme whose precursor form is released by the chief cells in the stomach and that degrades food proteins into peptides. Pepsin was discovered in 1836 by Theodor Schwann who also coined this enzyme's name from the Greek word pepsis, meaning digestion (peptein: to digest). It was the first animal enzyme to be discovered, and, in 1929,) and hydrochloric acid Hydrochloric acid is the solution of hydrogen chloride (H , which kills or inhibits bacteria The bacteria ( [bækˈtɪəriə] ; singular: bacterium)[α] are a large group of single-celled, prokaryote microorganisms. Typically a few micrometres in length, bacteria have a wide range of shapes, ranging from spheres to rods and spirals. Bacteria are ubiquitous in every habitat on Earth, growing in soil, acidic hot springs, radioactive waste, and provides the acidic pH In chemistry, pH is a measure of the acidity or basicity of a solution. It approximates but is not equal to p[H], the negative logarithm of the molar concentration of dissolved hydronium ions (H3O+); a low pH indicates a high concentration of hydronium ions, while a high pH indicates a low concentration. Crudely, this negative of the logarithm for the proteases to work. Food is churned by the stomach through muscular contractions of the wall - reducing the volume of the fundus, before looping around the fundus^[3] and the body of stomach as the boluses are converted into chyme Chyme is the semifluid mass of partly digested food expelled by the stomach into the duodenum. In other words, chyme is half-digested food (partially-digested food). Chyme slowly passes through the pyloric sphincter and into the duodenum The duodenum is the first section of the small intestine in most higher vertebrates, including mammals, reptiles, and birds. In fish, the divisions of the small intestine are not as clear and the terms anterior intestine or proximal intestine may be used instead of duodenum. In mammals the duodenum may be the principal site for iron absorption, where the extraction of nutrients begins. Depending on the quantity and contents of the meal, the stomach will digest the food into chyme anywhere between 40 minutes and a few hours.

Anatomy of the Stomach

The stomach lies between the esophagus The esophagus or oesophagus , sometimes known as the gullet, is an organ in vertebrates which consists of a muscular tube through which food passes from the pharynx to the stomach. The word esophagus is derived from the Latin œsophagus, which derives from the Greek word oisophagos , lit. "entrance for eating." In humans the esophagus is and the duodenum The duodenum is the first section of the small intestine in most higher vertebrates, including mammals, reptiles, and birds. In fish, the divisions of the small intestine are not as clear and the terms anterior intestine or proximal intestine may be used instead of duodenum. In mammals the duodenum may be the principal site for iron absorption (the first part of the small intestine In vertebrates, the small intestine is the part of the gastrointestinal tract following the stomach and followed by the large intestine, and is where the vast majority of digestion and absorption of food takes place. In invertebrates such as worms, the terms "gastrointestinal tract" and "large intestine" are often used to). It is on the left upper part of the abdominal cavity The abdominal cavity is the body cavity of the human body that holds the bulk of the viscera. It is located below (or inferior to) the thoracic cavity, and above the pelvic cavity. It is a part of the abdominopelvic cavity. The top of the stomach lies against the diaphragm In the anatomy of mammals, the thoracic diaphragm or sometime simply, the diaphragm, is a sheet of internal muscle that extends across the bottom of the rib cage. The diaphragm separates the thoracic cavity from the abdominal cavity and performs an important function in respiration. A diaphragm in anatomy can refer to other flat structures such as. Lying behind the stomach is the pancreas The pancreas is a gland organ in the digestive and endocrine system of vertebrates. It is both an endocrine gland producing several important hormones, including insulin, glucagon, and somatostatin, as well as an exocrine gland, secreting pancreatic juice containing digestive enzymes that pass to the small intestine. These enzymes help to further. The greater omentum The greater omentum is a large fold of peritoneum that hangs down from the stomach, and extends from the stomach to the posterior abdominal wall after associating with the transverse colon. The common anatomical term " epiploic" derives from "epiploon" from the Greek " epipleein" meaning to float or sail on, since the hangs down from the greater curvature.

Two sphincters, keep the contents of the stomach contained. They are the esophageal sphincter (found in the cardiac region, not an anatomical sphincter) dividing the tract above, and the Pyloric sphincter dividing the stomach from the small intestine.

The stomach is surrounded by parasympathetic (stimulant) and orthosympathetic (inhibitor) plexuses (networks of blood vessels and nerves in the anterior Standard anatomical terms of location are employed in science which deal with the anatomy of animals to avoid ambiguities which might otherwise arise. They are not language-specific, and thus require no translation. They are universal terms that may be readily understood by zoologists who speak any language gastric, posterior Standard anatomical terms of location are employed in science which deal with the anatomy of animals to avoid ambiguities which might otherwise arise. They are not language-specific, and thus require no translation. They are universal terms that may be readily understood by zoologists who speak any language, superior Standard anatomical terms of location are employed in science which deal with the anatomy of animals to avoid ambiguities which might otherwise arise. They are not language-specific, and thus require no translation. They are universal terms that may be readily understood by zoologists who speak any language and inferior Standard anatomical terms of location are employed in science which deal with the anatomy of animals to avoid ambiguities which might otherwise arise. They are not language-specific, and thus require no translation. They are universal terms that may be readily understood by zoologists who speak any language, celiac and myenteric), which regulate both the secretions activity and the motor (motion) activity of its muscles.

In humans, the stomach has a relaxed, near empty volume of about 45 ml. It is a distensible organ. It normally expands to hold about 1 litre of food,^[4] but will hold as much as 2-3 litres(whereas a newborn baby will only be able to retain 30ml).

Sections

The stomach is divided into 4 sections, each of which has different cells and functions. The sections are:

Cardia The cardia is the anatomical term for the part of the stomach attached to the esophagus. The cardia begins immediately distal to the z-line of the gastroeosphageal junction, where the squamous epithelium of the esophagus gives way to the columnar epithelium of the gastrointestinal tract.	Where the contents of the esophagus empty into the stomach.
Fundus The fundus of the stomach is the left portion of the stomach's body, and is marked off from the remainder of the body by a plane passing horizontally through the cardiac orifice	Formed by the upper curvature of the organ.
Body or Corpus	The main, central region.
Pylorus The pylorus is the region of the stomach that connects to the duodenum. It is divided in two parts:	The lower section of the organ that facilitates emptying the contents into the small intestine.

Blood supply

Blood supply to the stomach: left In human anatomy, the left gastric artery arises from the celiac artery, and runs along the superior portion of the lesser curvature of the stomach. Branches also supply the lower esophagus. The left gastric artery anastomoses with the right gastric artery, which supplies the inferior portion and right gastric artery, left and right gastro-omental artery and short gastric artery.^[5]

The lesser curvature of the stomach is supplied by the right gastric artery inferiorly, and the left gastric artery In human anatomy, the left gastric artery arises from the celiac artery, and runs along the superior portion of the lesser curvature of the stomach. Branches also supply the lower esophagus. The left gastric artery anastomoses with the right gastric artery, which supplies the inferior portion superiorly, which also supplies the cardiac region. The greater curvature is supplied by the right gastroepiploic artery inferiorly and the left gastroepiploic artery superiorly. The fundus of the stomach, and also the upper portion of the greater curvature, are supplied by the short gastric artery.

Like the other parts of the gastrointestinal tract, the stomach walls are made of the following layers, from inside to outside:

mucosa The mucous membranes are linings of mostly endodermal origin, covered in epithelium, which are involved in absorption and secretion. They line various body cavities that are exposed to the external environment and internal organs. They are at several places continuous with skin: at the nostrils, the lips, the ears, the genital area, and the anus	The first main layer. This consists of an epithelium Epithelium is a tissue composed of cells that line the cavities and surfaces of structures throughout the body. Many glands are also formed from epithelial tissue. It lies on top of connective tissue, and the two layers are separated by a basement membrane, the lamina propria The lamina propria is a constituent of the moist linings known as mucous membranes or mucosa, which line various tubes in the body composed of loose connective tissue and which has gastric glands in it underneath, and a thin layer of smooth muscle Smooth muscle is an involuntary non-striated muscle. It is divided into two sub-groups; the single-unit and multiunit smooth muscle. Within single-unit smooth muscle tissues, the autonomic nervous system innervates a single cell within a sheet or bundle and the action potential is propagated by gap junctions to neighboring cells such that the called the muscularis mucosae The lamina muscularis mucosae is the thin layer of smooth muscle found in most parts of the gastrointestinal tract, located outside the lamina propria mucosae and separating it from the submucosa.
submucosa In the gastrointestinal tract, the submucosa is the layer of dense irregular connective tissue that supports the mucosa, as well as joins the mucosa to the bulk of underlying smooth muscle	This layer lies over the mucosa and consists of fibrous connective tissue In zootomy, fibrous connective tissue is a type of connective tissue which has relatively high tensile strength, separating the mucosa from the next layer. The Meissner's plexus is in this layer.
muscularis externa	Over the submucosa, the muscularis externa in the stomach differs from that of other GI organs in that it has three layers of smooth muscle instead of two. inner oblique layer: This layer is responsible for creating the motion that churns and physically breaks down the food. It is the only layer of the three which is not seen in other parts of the digestive system. The antrum has thicker skin cells in its walls and performs more forceful contractions than the fundus. middle circular layer: At this layer, the pylorus is surrounded by a thick circular muscular wall which is normally tonically constricted forming a functional (if not anatomically discrete) pyloric sphincter, which controls the movement of chyme into the duodenum. This layer is concentric to the longitudinal axis of the stomach. outer longitudinal layer: Auerbach's plexus is found between this layer and the middle circular layer.
serosa	This layer is over the muscularis externa, consisting of layers of connective tissue continuous with the peritoneum.

Micrograph showing a cross section of the stomach wall, in the body portion of the stomach. H&E stain. Microscopic cross section of the pyloric part of the stomach wall.

Glands

The epithelium of the stomach forms deep pits. The glands at these locations are named for the corresponding part of the stomach:

Cardiac glands (at cardia)	Pyloric glands (at pylorus)	Fundic glands (at fundus)

Different types of cells are found at the different layers of these glands:

Layer of stomach	Name	Secretion	Region of stomach	Staining
Isthmus of gland	Mucous neck cells	mucus gel layer	Fundic, cardiac, pyloric	Clear
Body of gland	parietal (oxyntic) cells	gastric acid and intrinsic factor	Fundic, cardiac, pyloric	Acidophilic
Base of gland	chief (zymogenic) cells	pepsinogen	Fundic only	Basophilic
Base of gland	enteroendocrine (APUD) cells	hormones gastrin, histamine, endorphins, serotonin, cholecystokinin and somatostatin	Fundic, cardiac, pyloric	-

Control of secretion and motility

The movement and the flow of chemicals into the stomach are controlled by both the autonomic nervous system and by the various digestive system hormones:

Gastrin	The hormone gastrin causes an increase in the secretion of HCl from the parietal cells, and pepsinogen from chief cells in the stomach. It also causes increased motility in the stomach. Gastrin is released by G-cells in the stomach in response to distenstion of the antrum, and digestive products(especially large quantities of incompletely digested proteins). It is inhibited by a pH normally less than 4 (high acid), as well as the hormone somatostatin.
Cholecystokinin	Cholecystokinin (CCK) has most effect on the gall bladder, causing gall bladder contractions, but it also decreases gastric emptying and increases release of pancreatic juice which is alkaline and neutralizes the chyme.
Secretin	In a different and rare manner, secretin, produced in the small intestine, has most effects on the pancreas, but will also diminish acid secretion in the stomach.
Gastric inhibitory peptide	Gastric inhibitory peptide (GIP) decreases both gastric acid release and motility.
Enteroglucagon	enteroglucagon decreases both gastric acid and motility.

Other than gastrin, these hormones all act to turn off the stomach action. This is in response to food products in the liver and gall bladder, which have not yet been absorbed. The stomach needs only to push food into the small intestine when the intestine is not busy. While the intestine is full and still digesting food, the stomach acts as storage for food.

EGF in gastric defense

Epidermal growth factor or EGF results in cellular proliferation, differentiation, and survival.^[6] EGF is a low-molecular-weight polypeptide first purified from the mouse submandibular gland, but since then found in many human tissues including submandibular gland, parotid gland. Salivary EGF, which seems also regulated by dietary inorganic iodine, plays also an important physiological role in the maintenance of oro-esophageal and gastric tissue integrity. The biological effects of salivary EGF include healing of oral and gastroesophageal ulcers, inhibition of gastric acid secretion, stimulation of DNA synthesis as well as mucosal protection from intraluminal injurious factors such as gastric acid, bile acids, pepsin, and trypsin and to physical, chemical and bacterial agents.^[7]

Stomach as nutrition sensor

The stomach can "taste" sodium glutamate using glutamate receptors^[8] and this information is passed to the lateral hypothalamus and limbic system in the brain as a palatability signal through the vagus nerve.^[9] The stomach can also sense independently to tongue and oral taste receptors glucose,^[10] carbohydrates^[11] proteins,^[11] and fats.^[12] This allows the brain to link nutritional value of foods to their tastes.^[10]

Diseases of the stomach

Main article: Stomach disease

Historically, it was widely believed that the highly acidic environment of the stomach would keep the stomach immune from infection. However, a large number of studies have indicated that most cases of peptic ulcers, gastritis, and stomach cancer are caused by Helicobacter pylori infection.

In other animals

An endoscopy of a normal stomach of a healthy 65-year old woman.

Although the precise shape and size of the stomach varies widely between different vertebrates, the relative positions of the oesophageal and duodenal openings remain relatively constant. As a result, the organ always curves somewhat to the left before curving back to meet the pyloric sphincter. However, lampreys, hagfishes, chimaeras, lungfishes, and some teleost fish have no stomach at all, with the oesophagus opening directly into the intestine. These animals all consume diets that either require little storage of food, or no pre-digestion with gastric juices, or both.^[13]

The gastric lining is usually divided into two regions, an anterior portion lined by fundic glands, and a posterior with pyloric glands. Cardiac glands are unique to mammals, and even then are absent in a number of species. The distributions of these glands vary between species, and do not always correspond with the same regions as in man. Furthermore, in many non-human mammals, a portion of the stomach anterior to the cardiac glands is lined with epithelium essentially identical to that of the oesophagus. Ruminants, in particular, have a complex stomach, the first three chambers of which are all lined with oesophageal mucosa.^[13]

In birds and crocodilians, the stomach is divided into two regions. Anteriorly is a narrow tubular region, the proventriculus, lined by fundic glands, and connecting the true stomach to the crop. Beyond lies the powerful muscular gizzard, lined by pyloric glands, and, in some species, containing stones that the animal swallows to help grind up food.^[13]

Comparison of stomach glandular regions from several mammalian species. Yellow: esophagus; green: aglandular epithelium; purple: cardiac glands; red: gastric glands; blue: pyloric glands; dark blue: duodenum. Frequency of glands may vary more smoothly between regions than is diagrammed here. Asterisk (ruminant) represents the omasum, which is absent in Tylopoda (Tylopoda also has some cardiac glands opening onto ventral reticulum and rumen^[14]) Many other variations exist among the mammals.^[15][16]

See also

• Adjustable gastric band
• Foveolar cells, mucous producing cells of the stomach
• Peristalsis, muscular movement that occurs in the stomach
• Borborygmus, growling of stomach

References

1. ^ Physiology at MCG 6/6ch2/s6ch2_30
2. ^ stomach at The Anatomy Lesson by Wesley Norman (Georgetown University)
3. ^ Richard M. Gore; Marc S. Levine. (2007). Textbook of Gastrointestinal Radiology. Philadelphia, PA.: Saunders. ISBN 1416023321.
4. ^ Sherwood, Lauralee (1997). Human physiology: from cells to systems. Belmont, CA: Wadsworth Pub. Co. ISBN 0314092455. OCLC 35270048.
5. ^ Anne M. R. Agur; Moore, Keith L. (2007). Essential Clinical Anatomy (Point (Lippincott Williams & Wilkins)). Hagerstown, MD: Lippincott Williams & Wilkins. ISBN 078176274X. OCLC 172964542. ; p. 150
6. ^ Herbst RS (2004). "Review of epidermal growth factor receptor biology". International Journal of Radiation Oncology, Biology, Physics 59 (2 Suppl): 21–6. doi:10.1016/j.ijrobp.2003.11.041. PMID 15142631.
7. ^ Venturi S.; Venturi M. (2009). "Iodine in evolution of salivary glands and in oral health". Nutrition and Health 20 (2): 119–134. PMID 19835108.
8. ^ Uematsu A, Tsurugizawa T, Kondoh T, Torii K. (2009). Conditioned flavor preference learning by intragastric administration of L-glutamate in rats. Neurosci Lett. Feb 27;451(3):190-3. PMID 19146916
9. ^ Uematsu A, Tsurugizawa T, Uneyama H, Torii K. (2010). Brain-gut communication via vagus nerve modulates conditioned flavor preference. Eur J Neurosci. 31(6):1136-43. doi:10.1111/j.1460-9568.2010.07136.x PMID 20377626
10. ^ ^{a b} de Araujo, I.E., Oliveira-Maia, A.J., Sotnikova, T.D., Gainetdinov, R.R., Caron, M.G., Nicolelis, M.A. & Simon, S.A. (2008) Food reward in the absence of taste receptor signaling. Neuron, 57, 930–941. PMID 18367093
11. ^ ^{a b} Perez, C., Ackroff, K. & Sclafani, A. (1996) Carbohydrate- and protein conditioned flavor preferences: effects of nutrient preloads. Physiol. Behav., 59, 467–474. PMID 8700948
12. ^ Ackroff, K., Lucas, F. & Sclafani, A. (2005) Flavor preference conditioning as a function of fat source. Physiol. Behav., 85, 448–460. PMID 15990126
13. ^ ^{a b c} Romer, Alfred Sherwood; Parsons, Thomas S. (1977). The Vertebrate Body. Philadelphia, PA: Holt-Saunders International. pp. 345–349. ISBN 0-03-910284-X.
14. ^ William O. Reece. "Functional Anatomy and Physiology of Domestic Animals". http://books.google.com/books?id=gvt_qSsLobUC&pg=PA350&lpg=PA350&dq=tylopoda+omasum&source=bl.
15. ^ Esther J. Finegan and C. Edward Stevens. "Digestive System of Vertebrates". http://www.cnsweb.org/digestvertebrates/WWWEdStevensCDAnatomy.html.
16. ^ Muhammad Khalil. "The anatomy of the digestive system". http://www.onemedicine.tuskegee.edu/DigestiveSystem/Stomach/Stomach_Ruminants.html.

External links

Look up stomach in Wiktionary, the free dictionary.

Wikimedia Commons has media related to: Stomach

• "Stomach" article from the Encyclopedia of Nursing & Allied Health, from enotes.com
• Digestion of proteins in the stomach or tiyan
• Site with details of how ruminants process food

Human systems and organs TA 2-4: musculoskeletal Skeletal system Bone (Carpus · Collar bone (clavicle) · Thigh bone (femur) · Fibula · Humerus · Mandible · Metacarpus · Metatarsus · Ossicles · Patella · Phalanges · Radius · Skull (cranium) · Tarsus · Tibia · Ulna · Rib · Vertebra · Pelvis · Sternum) · Cartilage Joints Fibrous joint · Cartilaginous joint · Synovial joint Muscular system Muscle · Tendon · Diaphragm TA 5-11: splanchnic/ viscus mostly Thoracic Respiratory system URT (Nose, Nasopharynx, Larynx) · LRT (Trachea, Bronchus, Lung) mostly Abdominopelvic Digestive system+ adnexa Mouth (Salivary gland, Tongue) · upper GI (Oropharynx, Laryngopharynx, Esophagus, Stomach) · lower GI (Small intestine, Appendix, Colon, Rectum, Anus) · accessory (Liver, Biliary tract, Pancreas) GU: Urinary system Kidney · Ureter · Bladder · Urethra GU: Reproductive system Female (Uterus, Vulva, Ovary, Placenta) · Male (Scrotum, Penis, Prostate, Testicle, Seminal vesicle) Endocrine system Pituitary · Pineal · Thyroid · Parathyroid · Adrenal · Islets of Langerhans TA 12-16 Circulatory system Cardiovascular system peripheral (Artery, Vein, Lymph vessel) · Heart Lymphatic system primary (Bone marrow, Thymus) · secondary (Spleen, Lymph node) N/S Nervous system (Brain, Spinal cord, Nerve) · Sensory system (Ear, Eye) Integumentary system Skin · Subcutaneous tissue · Breast (Mammary gland) Non-TA Immune system general anatomy: , , , ,

Anatomy of torso, digestive system: Gastrointestinal tract, excluding mouth (TA A05.3-7, GA 11.1141) Upper GI Hypo- pharynx Piriform sinus spaces: Peripharyngeal space (Retropharyngeal space, Parapharyngeal space) · Retrovisceral space (Retropharyngeal space, Danger space) · Prevertebral space Pterygomandibular raphe · Pharyngeal raphe · Buccopharyngeal fascia · Pharyngobasilar fascia Pharyngeal muscles Esophagus UES, LES Stomach Gastric rugae · gastric pits · cardia/gland · fundus/gland · pylorus/gland · pyloric antrum · pyloric canal · greater curvature · lesser curvature · angular incisure Lower GI Intestine: small Duodenum (Suspensory muscle, Major duodenal papilla, Minor duodenal papilla, Duodenal cap) • Duodenojejunal flexure • Jejunum • Ileum (Terminal ileum) • Ileocecal valve continuous (intestinal villus, crypts of Lieberkühn, circular folds) Intestine: large Vermiform appendix • Cecum • Colon (ascending colon, hepatic flexure, transverse colon, splenic flexure, descending colon, sigmoid colon) continuous (taenia coli, haustra, epiploic appendix) Termination Rectum: Houston valve • rectal ampulla • pectinate line Anal canal: anal valves • anal sinuses • anal columns • Hilton's white line Anus: Sphincter ani internus muscle • Sphincter ani externus muscle Lymph GALT: Peyer's patches (M cells) : DIG anat(, , )/// //, / , drug(////////)

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