MCQ Anatomy 063

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A newborn boy does not pass meconium until 48 hours after his birth. Two weeks later his mother reports that he has not been passing stool regularly. Anorectal manometry reveals increased internal anal sphincter pressure on rectal distention with a balloon. Radiographic studies reveal massive dilation of the colon proximal to the rectum. This indicates a developmental abnormality in which of the following embryonic tissues?

A. Ectoderm
B. Endoderm
First Aid Q&A for the USMLE Step 1, Second Edition (First Aid USMLE)C. Neural crest
D. Neural ectoderm
E. Splanchnic mesoderm

Answer

Category: Anatomy MCQs

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