Si 57m in length 3 parts duodenum consists of 4

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Unformatted text preview: orizontal line extending from cardia - Body: below horizontal line - Pyloric part: narrow funnel shaped region, consists of – antrum, canal and pylorus (with pyloric sphincter) - Rugae: longitudinal folds that allow stomach to expand; only seen when stomach is empty - Serosa: peritoneum covering the stomach Small Intestine (SI): 5 ­7m in length; 3 parts: - Duodenum: consists of 4 segments – superior/first segment, descending, transverse/horizontal/inferior and ascending; anatomically close relationship with the head of pancreas o 2nd segment receives pancreatic juice and bile – alkaline to neutralize acidic stomach secretions; means that 1st segment is not well protected, leading to increased risk of peptic ulcers - Jejenum: 2/5 of length of SI; coils constantly moving around, mostly in umbilical region - Ileum: 3/5 of length of SI; mostly in hypogastric region; ends into cecum of large intestine Large Intestine (LI): consists of 5 parts: - Cecum (blind): below ileocecal valve (with sphincter that regulates passage of material from ileum to cecum); vermiform appendix attaches to base (below age 10, responsible for producing antibodies) - Ascending: 10 ­12 cm; R lumbar region; ends at R colic flexure/hepatic flexure (touches liver) - Transverse: ~40 cm; ends in L colic (splenic) flexure - Descending: descends in L lumbar region CAPS391 Lecture 29 Summary st Date: March 21 , 2014 - Sigmoid (s ­shaped): ends with rectum (10 ­12 cm) and anal canal (3 ­4 cm) Anal canal: contains hemorrhoidal veins that connect portal with caval system; guarded by 2 sphincters: - External anal sphincter: voluntary, skeletal muscle - Internal anal sphincter: involuntary, made of concentric layers of smooth muscle (*wrong label in notes)...
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This document was uploaded on 03/30/2014.

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