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Anatomy · Embryology
Sample itemA boy has an empty right scrotum and a mass in the inguinal canal, and the testis fails to descend. Which fetal structure normally guides the descent of the testis?
Original practice item, not a recalled exam question. Nothing here is recorded.
The answer and the reasoning
B. Gubernaculum
The gubernaculum, a mesenchymal band from the testis to the scrotum, shortens and guides descent through the inguinal canal under androgen influence.
Option by option
A. Urogenital sinus
The urogenital sinus forms the bladder and urethra.
B. Gubernaculum (correct)
Correct. The gubernaculum anchors the testis and directs its descent into the scrotum.
C. Paramesonephric duct
The paramesonephric duct regresses in males under anti-Mullerian hormone.
D. Mesonephric duct
The mesonephric duct forms the epididymis, vas and seminal vesicle.
Source note: Original NextPrep sample item — pending expert review. This item is original practice material awaiting independent expert review, so confirm important facts in a standard textbook.
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