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Unformatted text preview: vessels that supply the intestinal wall. * Jejunum- approximately 2/5 (3 ft.) of the remainder of the SI. * Ileum- makes up the remaining 6-7 ft. of the SI. The terminal portion of the ileum empties into the medial side of the cecum (first portion of the large intestine) through the ileocecal valve. Micro Anatomy * The wall of the SI is composed of the same 4 layers that make up most of the GI tract. * There are special features for its digestive and absorptive functions:villi and microvilli. * villi- finger like fold of the mucosa that are more numerous in the duodenum and proximal part of the jejunum. * they are 1mm long and give the intestine its velvety appearance. * Villi vastly increase the surface area of the epithelium available for absorption and digestion. * Each villi has a connective tissue network containing blood vessels, nerves, and a lacteal (a lymphatic vessel that absorbs fat)...
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- Fall '10