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I. Orientation of Pelvis |
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WebLecture Slide 33 |
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Several structures pass through the pelvic diaphragm including the rectum, the urethra, and in the female, the vagina. Fascial layers of the pelvic diaphragm interlace with those of the pelvic effluents (rectum, urethra, vagina), as do the muscle fibers, and in this way keep the pelvis and perineum totally separate from one another. As noted previously, the pudendal nerve takes
an alternate route to get past the pelvic diaphragm. It does not
penetrate the pelvic diaphragm but instead leaves the pelvis with the piriformis
muscle using the greater sciatic foramen, the muscle heading laterally
for the greater trochanter of the femur. The nerve continues inferoanteriorly
and enters the perineum via the lesser sciatic foramen. The nerve continues
this trajectory passing through the ischiorectal fossa within a fascial
sheath, the pudendal canal, that contains the nerve and the internal pudendal
vessels. The canal runs along the ischialpubic ramus and is not shown
here.
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