USMLE Forum Archives - USMLE Step 1 - Histology
Histology
drspleen - 03-08-11 20:58
A tissue sample from an unknown part of the GI tract contains only striated muscle in the muscularis externa. Which part of the GI tract is this sample from?
drspleen - 03-08-11 20:58
A tissue sample from an unknown part of the GI tract contains only striated muscle in the muscularis externa. Which part of the GI tract is this sample from?
The correct answer and explanation will be available after you answer.
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#4
Re: Histology babbu5508 - 03-19-11 18:52 My answer is: e.
among the GIT, only the upper 1/3rd of the esophagus contains only striated muscle in the muscularis externa....
#5
Re: Histology
drspleen - 03-22-11 15:33 Only striated muscle is found in the muscularis externa of the upper 1/3 of the esophagus. The middle 1/3 of the esophagus consists of a mixture of striated and smooth muscle and the lower 1/3 is solely smooth muscle. The duodenum and colon have smooth muscle in their muscularis externa.
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