Neurosonology Practice Exam

Which structure forms the posterior boundary of the prostate?

Bladder Urogenital Diaphragm Rectum Levator Ani

Correct Answer:

Rectum

Explanation:

In the male pelvis, the prostate sits just in front of the rectum, so its posterior surface directly faces the rectal wall. This makes the rectum the posterior boundary of the prostate. Denonvilliers’ fascia separates these two structures, but the boundary that lies behind the prostate is the rectum. The bladder sits above the prostate, not behind it, and the urogenital diaphragm and levator ani form parts of the pelvic floor and lateral boundaries rather than the posterior face of the prostate. Clinically, this relationship explains why the posterior aspect of the prostate is accessible via a digital rectal exam and why posterior spread to the rectum is a consideration in prostate surgery.

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