Dissection of male pelvis from a lateral approach
Nerve supply to levator ani and coccygeus muscles, medial view
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Image #172-5
Dissection of male pelvis from a lateral approach
Nerve supply to levator ani and coccygeus muscles, medial view
The prostate has been removed. The superior fascia of the pelvic diaphragm has been dissected to expose the branches from the third and fourth sacral nerves that supply the muscles of the right half of the diaphragm. Note that one nerve (25) passes into the coccygeus muscle and emerges inferiorly on the medial side of the levator ani.
- Left pointer: Lateral umbilical ligament (cut off) Right pointer: Superior vesical artery (cut off)
- Psoas major muscle
- Femoral nerve
- Iliacus muscle
- Upper pointer: Obturator artery Lower pointer: Obturator nerve
- External iliac artery and vein
- Lacunar ligament
- Superior pubic ramus
- Obturator fascia (obturator internus visible deep to fascia)
- Pubic symphysis
- Levator ani muscle (puborectalis muscle, covered by fascia)
- Tendinous arch of pelvic fascia
- Internal iliac artery
- Lumbosacral trunk
- Left pointer: Superior gluteal artery Right pointer: Lateral sacral artery
- Sacral nerve I
- Left pointer: Internal pudendal artery Right pointer: Inferior gluteal artery
- Sympathetic trunk
- Sacral nerve II
- Sacrum (cut away near midline)
- Sacral nerve III
- Piriform muscle
- Sacrum (dorsal surface)
- Upper pointer: Pudendal nerve Lower pointer: Sciatic nerve
- Nerve to Levator ani muscle and coccygeus muscle (this branch penetrates muscle, reappearing on the inner surface of the muscle nearly opposite the anal canal)
- Nerve to Levator ani muscle
- Coccyx
- Coccygeus muscle
- Location of ischial spine
- Anococcygeal ligament
- Levator ani muscle (pointer on iliococcygeus muscle)
- Levator ani muscle (pointer on pubococcygeus muscle)
- Tendinous arch of levator ani muscle (not clearly defined in this specimen)
- Anal canal
- Urogenital diaphragm
- Urethra