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Small intestine (small bowel)
extends 20 feet from the pyloric sphincter to the 1st part of the large intestine; has three parts: the duodenum, jejunum, and the ileum
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duodenum
only 1 foot longand receives food from the stomach as well as bile from the liver and gallbladder and pancreatic juice from the pancreas
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jejunum
the second part of the small intestine about 8 feet long
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the ileum
the third section that's about 11 feet long and attaches to the first part of the large intestine
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fundus and body
resevoir for ingested food and an area for action by acid and pepsin
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antrum
muscular grinding chamber that breaks up food and feeds it gradually into the duodenum
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Large intestine
extends from the end of the ileum to the anus and has three components: the cecum, the colon, and the rectum
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cecum
pouch on the right side that connects the ileum at the ileocecal valve (sphincter)
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appendix
hangs from the cecum, no clear purpose, and can become inflamed and infected when in is clogged or blocked.
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colon
five feet long and has four named segments: ascending, descending, transverse, and sigmoid
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ascending colon
extends from the cecum to the undersurface of the liver, where it goes left to become a transverse colon
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transverse colon
passes horizontally to the left toward the spleen and then turns downward into the descending colon
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sigmoid colon
shaped like an S and begins at the distal end of the descending colon and leads into the rectum
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anus
the lower opening of the gastrointestinal tract
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defecation
the expulsion or passage of stools from the body through the butt
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