Gross Anatomy II Palmer Exam 4 Practice

Which muscle is NOT a component of the urogenital diaphragm?

Coccygeus muscle External sphincter urethrae Compressor urethrae Deep transverse perineal muscle

Correct Answer:

Coccygeus muscle

Explanation:

The urogenital diaphragm is the muscular layer of the deep perineal region that encircles the urethra and supports the anterior pelvic outlet, including muscles like the external sphincter urethrae and the deep transverse perineal muscle (with the compressor urethrae contributing in females). The coccygeus, however, is part of the pelvic diaphragm, running from the ischial spine to the coccyx and sacrum to support pelvic viscera and close the posterior pelvic outlet. It does not participate in the urogenital diaphragm.

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