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pelvic floor

n. (context anatomy English) Muscular partition formed by the muscle fibers of the levator ani, the coccygeus, and associated connective tissue which span the area underneath the pelvis.

Wikipedia
Pelvic floor

The pelvic floor or pelvic diaphragm is composed of muscle fibers of the levator ani, the coccygeus muscle, and associated connective tissue which span the area underneath the pelvis. The pelvic diaphragm is a muscular partition formed by the levatores ani and coccygei, with which may be included the parietal pelvic fascia on their upper and lower aspects. The pelvic floor separates the pelvic cavity above from the perineal region (including perineum) below.