Editing Stomach (section)

==Other animals==
Although the precise shape and size of the stomach varies widely among different vertebrates, the relative positions of the esophageal 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, [[lamprey]]s, [[hagfish]]es, [[chimaera]]s, [[lungfish]]es, and some [[teleost]] fish have no stomach at all, with the esophagus opening directly into the intestine. These animals all consume diets that require little storage of food, no predigestion with gastric juices, or both.<ref name=VB>{{cite book |author=Romer, Alfred Sherwood|author2=Parsons, Thomas S.|year=1977 |title=The Vertebrate Body |publisher=Holt-Saunders International |location= Philadelphia, PA|pages= 345–349|isbn= 978-0-03-910284-5}}</ref>

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| [[File:Mammalian Stomachs remake.png|thumb|upright=1.50|Comparison of stomach glandular regions from several mammalian species. 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 have some cardiac glands opening onto ventral [[Reticulum (anatomy)|reticulum]] and [[rumen]]<ref>{{cite book|url=https://books.google.com/books?id=gvt_qSsLobUC&q=tylopoda+omasum&pg=PA350|title=Functional Anatomy and Physiology of Domestic Animals|author=William O. Reece|isbn=978-0-7817-4333-4|year=2005|publisher=Wiley }}</ref>)  Many other variations exist among the mammals.<ref>{{cite web |url=http://www.cnsweb.org/digestvertebrates/WWWEdStevensCDAnatomy.html |archive-url=https://web.archive.org/web/20081201045413/http://www.cnsweb.org/digestvertebrates/WWWEdStevensCDAnatomy.html |url-status=dead |archive-date=2008-12-01 |title=Digestive System of Vertebrates |author1=Finegan, Esther J. |author2=Stevens, C. Edward |name-list-style=amp }}</ref><ref>{{cite web|url=http://www.onemedicine.tuskegee.edu/DigestiveSystem/Stomach/Stomach_Ruminants.html|archive-url=https://web.archive.org/web/20101130085507/http://www.onemedicine.tuskegee.edu/DigestiveSystem/Stomach/Stomach_Ruminants.html|url-status=dead|archive-date=2010-11-30|title=The anatomy of the digestive system|author=Khalil, Muhammad|website=onemedicine.tuskegee.edu}}</ref>]]
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;<span style="color:#E2E200;">Yellow</span>: [[Oesophagus|Esophagus]]
;<span style="color:#00AD00;">Green</span>: [[Oesophageal (nonglandular) region|Esophageal (nonglandular) region]].<ref name=APFA>{{cite book |author=Wilke, W. L.  |author2=Fails, A. D.|author3= Frandson, R. D.|year=2009 |title=Anatomy and physiology of farm animals |publisher=Wiley-Blackwell |location= Ames, Iowa|pages= 346|isbn= 978-0-8138-1394-3}}</ref>
;<span style="color:#A700C3;">Purple</span>: [[Cardiac gland region]].<ref name=APFA/>
;<span style="color:#C70000;">Red</span>: [[Fundic gland region]].<ref name=APFA/>
;<span style="color:#247AFF;">Blue</span>: [[Pyloric gland region]].<ref name=APFA/>
;<span style="color:#2A2AFF;">Dark blue</span>: [[Duodenum]]
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The gastric lining is usually divided into two regions, an anterior portion lined by fundic glands and a posterior portion lined with pyloric glands. Cardiac glands are unique to [[mammal]]s, 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 humans. 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 esophagus. [[Ruminant]]s, in particular, have a complex four-chambered stomach. The first three chambers ([[rumen]], [[Reticulum (anatomy)|reticulum]], and [[omasum]]) are all lined with esophageal mucosa,<ref name=VB/> while the final chamber functions like a [[monogastric]] stomach, which is called the [[abomasum]].

In [[bird]]s and [[crocodilian]]s, 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 (anatomy)|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.<ref name=VB/>

In [[insect]]s, there is also a crop. The insect stomach is called the [[insect#Midgut|midgut]].

Information about the stomach in [[echinoderm]]s or [[mollusc]]s can be found under the respective articles.