Flashcards in Week 6 - Anatomy of Intestines Deck (30):
What is the most common site of duodenal ulcers?
-Superior duodenum (duodenal cap)
Which part of the duodenum contains the major duodenal papilla?
What is DJ flexure?
-Deuodenaljejunal flexure between ascending duodenum and jejunum
What is the suspensory muscle of duodenum?
-Located at DJ flexure contration of this muscle increases the angle to facilitate movement of intestinal contents
What are the two major causes of duodenal ulcers?
-Chronic NSAID use
What are 2 possible complications of duodenal ulcers?
-Erosion into the gastroduodenal artery
-Perforation of the bowel leading to peritonitis
What is the ileocecal junction?
-Where ileum invaginates into cecum to form ileocecal valve
What is the function of ileocecal valve?
Describe the arterial supply and venous drainage of the small bowel
-Duodenum before major duodenal papilla ->gastroduodenal
-Duodenum after MDP-> inferior pancreaticoduodenal
-Jejunoileum -> SMA branches into arcades ->vasarecta
-Venous drainage follows the arteries into HPV
Where does the IMV drain into?
Describe the branches of the SMA
->anastamose to form marginal artery
From which side of the aorta does the SMA arise?
What are paracolic gutters?
-Empty spaces next to the ascending/descending colon where fluid can collect
Where would to cecum be palpated if enlarged?
What are the flexures in the colon?
-Hepatic on the right
-Splenic on the left
What are the 3 types of tenia? What is there function?
-Large strips of muscle which contract to shorten the wall of the bowel and form haustra
Where is the appendix?
-Joint to the cecum
What are haustra?
-Pouches formed by tenia coli
What is the rectal ampulla?
-Widest part of the rectum
What are omental appendices?
-Small fat filled pouches of peritoneum which cover the colon
What is the watershed area in the colon?
-Splenic flexure -> Most susceptible to ischaemia when bp is low as there is no direct blood supply -> only served by anastamoses
What is the pouch of douglas?
-A space in women formed by the posterior wall of the uterus and the rectum
What is the retro-vesicle pouch?
-A space in men formed by posterior wall of bladder and colon
What is the significance of the pouches in the pelvis?
-Fluid can accumulate here during disease
What is the main function of the colon?
What is appendicitis?
-Acute inflammation of the appendix
Where is the tenderness felt in appendicitis once localised?
-Mc Burneys point
What is the cause of appendicitis?
-Proliferation of lymphoid tissue, faecolif, helminth, causes blockage
-Stasis of contents and multiplication of bacteria
Describe the branches of the IMA
-Becomes superior rectal
-> anastamose to form marginal artery