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Laboratory 44. The Male Pelvis
Step 12. Muscles of the Pelvic Diaphragm

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The levator ani muscle provides stability and elasticity to the pelvic floor as well as support to the pelvic organs.

The levator ani muscle is composed of three parts:
  • puborectalis muscle, which attaches to the pubic rami and encircles the rectum. This muscle provides support to the urinary bladder and the prostate gland. It also maintains the anorectal angle
  • pubococcygeus muscle, which attaches to the pubic rami and the coccyx
  • iliococcygeus muscle, which originates from the arcus tendinous of the levator ani muscle on the obturator internus fascia

Links and References:
Grant's: 3.41
Netter (1ed.): 377, 337, 338 (2ed.): 373, 333, 334
Rohen/Yokochi: 323