Small Bowel Flashcards
retroperitoneal portions of the duodenum
descending and transverse
transition point between the third and fourth portions of the duodenum
acute angle between the aorta and SMA
site of B12 absorption
terminal ileum
site of iron absorption
duodenum
90 % of water absorption
jejunum
vascular supply of jejunum
SMA
intestinal brush border
maltase sucrase, limit dextrinase, lactase
M cells
antigen presenting cells in the intestinal wall
Peyers patches
lymphoid tissue, incureased in the ileum
absorption of bile salts
45 % ileum, 5 % colon passive
50% active in terminal ileum
conjugation of bile
to taurine and glycine
primary bile acids
cholic and chenodeoxycholic acid
secondary biles acids
deoxycholic and lithocholic
short gut syndrome
diarrhea, steatorrhea, weight loss, nutritional deficiency
check for fecal fat
sudan red stain
schilling test
tests for B12 absorption (radiolabeled B 12 in urine)
causes of steatorrhea
gastric acid hypersecretion of acid
interruption of bile salt reorption
non healing fistulas
FRIENDS
foreign body, radiation, inflammatory bowel disease, epitheliazation, neoplasm,, distal obstruction, sepsis/ infection
air in the biliary tree
gallstone ileus
gallstone ileus
SBO fro gallstone in terminal ileum
fistula between gallbladder ans second protion of duodenum
meckels diverticulum
2 ft from ileocecal valve, 2 % of population, 2 yr of life at presentation
2 types of tissue - pancreas and gastric
failure of closure of the omphalomesenteric duct
meckels diverticulum
most common tissue found in meckels diverticulum
pancreas tissue
most likely tissue in meckels to be symptomatic
gastric mucosa
breakdown product of serotonin
5-HIAA - can be measured in urine
precursor of serotonin
tryptophan
produces serotonin
kulchitsky cells (enterochromaffin cell)
carcinoid syndrome
intermittent flushing and diarrhea
most common site for carcinoid tumor
appendix
carcinoid in appendix < 2 cm
appendectomy
carcinoid in appendix > 2cm or involving base
right hemicolectomy
Peutz jeghers syndrome
jejunal and ileal hamartomas, mucocutaneous melanotic skin pigmentation
most common cause of appendicitis in children
hyperplasia
most common cause of appendicitis in adults
fecalith
most likely spot of appendix to perforate
midpoint of antimesenteric border
