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NBME 22 Answers

nbme22/Block 2/Question#46

A 62-year-old man is being evaluated for rectal ...

Greater mucosal surface area

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submitted by hayayah(411),

X in the image is the small intestine. Its characteristic feathery appearance after a barium meal is due to permanent circular folds and villi. The villi give the small intestine a great mucosal surface area.

nwinkelmann  Yes. The appearance of the mucosal folds depends upon the diameter of the bowel, and when they fold they appear feathery. Mucosal folds are largest and most numerous in the jejunum and tend to disappear in the lower part of the ileum. +  




What is the letter Y indicating in the picture? is it the large intestine?

humble_station  For this answer to make sense to me, Y should be the beginning of the large intestine like the terminal ileum/cecum leading up to the ascending colon +  




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submitted by sweetmed(38),

PLica circularis: muscosal folds that extend from distal duodenum to proximal ileum FA2018 pg 356