What structure separates the pelvis from the perineum?

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Study for the NBME Gross Anatomy High Yield Test. Enhance your learning with flashcards and multiple-choice questions, each detailed with hints and explanations. Prepare effectively for your anatomy exam!

Multiple Choice

What structure separates the pelvis from the perineum?

Explanation:
The pelvic diaphragm serves as the boundary between the pelvis and the perineum. This muscular floor, formed mainly by the levator ani group (puborectalis, pubococcygeus, iliococcygeus) together with the coccygeus, closes off the pelvic cavity and supports the pelvic organs. Everything below this muscular sheet is the perineum, while above it lies the true pelvis. The other structures sit within the perineum or are fascial components of it and do not mark the division between pelvis and perineum.

The pelvic diaphragm serves as the boundary between the pelvis and the perineum. This muscular floor, formed mainly by the levator ani group (puborectalis, pubococcygeus, iliococcygeus) together with the coccygeus, closes off the pelvic cavity and supports the pelvic organs. Everything below this muscular sheet is the perineum, while above it lies the true pelvis.

The other structures sit within the perineum or are fascial components of it and do not mark the division between pelvis and perineum.

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