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URL:https://www.learndesk.us/class/5691831830446080/lesson/a5e989f887004b8568efee87913d1481?ref=outlook-calendar
SUMMARY:12.6 The Intestines, Rectum and Anus
DTSTART;TZID=America/Los_Angeles:20260409T190000
DTEND;TZID=America/Los_Angeles:20260409T200000
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DESCRIPTION: Small Intestine

The small intestine is a long muscular tube approximately 6 m, twenty feet long, comprising the duodenum 25-30 an, 10-12 inches, the jejunum, approximately 2.4 m, 8 feet, and the ileum approximately 3.6 m, 12 feet. Four layers comprise the small intestine. The outer serous coat of the peritoneum is a delicate membrane, the mesentery which suspends the intestines to the posterior abdominal wall.
The mesentery carries the mesenteric arteries and veins as well as lymphatic vessels which empty into mesenteric lymph nodes, then into the thoracic duct. The muscular coat consists of circular and longitudinal smooth muscles which cause peristalsis by segmental contraction. The submucous layer contains blood vessels and fibrous tissue. The mucous coat is characterized by villi which provide an enormous absorptive surface. The crypts of Lieberkuhn secrete an alkaline enzyme known as succus entericus. In the small intestine, amino acids, sugars, minerals, glycerol, some fatty...

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