Perineal Muscles

The anal canal is separated from the urogenital organs by the perineum,which contains the perineal body (see Figure 4-2.6, Chapter 4-2). The perineal body, from superficial to deep, contains the superficial and deep transverse perineii muscles and the anterior extension of the external sphincter, which inserts upon the bulbocavernosus. Below the pelvic diaphragm is the triangular urogenital diaphragm. It lies at the level of the hymenal ring and attaches to the urethra, vagina, and perineal body and to the ischiopubic rami. Just above the urogenital diaphragm membrane are compressor muscles for the urethra and vagina.

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