Dissection of male pelvis from a lateral approach

Sacral plexus and pelvic diaphragm, medial view with blood vessels removed

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Image #172-6

Dissection of male pelvis from a lateral approach Sacral plexus and pelvic diaphragm, medial view with blood vessels removed The arteries and veins have been removed from the central area of dissection to expose the sacral plexus as it passes through the greater sciatic foramen. 1 . Iliolumbar artery 2 . Psoas major muscle 3 . Iliacus muscle 4 . Obturator nerve 5 . Femoral nerve 6 . Linea terminalis 7 . Ductus deferens (cut off) 8 . External iliac artery and vein (passing downward deep to inguinal ligament) 9 . Obturator artery 10 . Pubic symphysis (sectioned) 11 . Obturator internus muscle (covered by obturator fascia) 12 . Tendinous arch pelvic fascia 13 . Urethra (opened) 14 . Urogenital diaphragm (dissected) 15 . Lumbosacral trunk 16 . Lateral sacral artery 17 . Superior gluteal artery 18 . Sympathetic trunk (pointer on ganglion) 19 . Left pointer: Greater sciatic foramen Right pointer: Sciatic nerve 20 . Sacrum (partially resected) 21 . Sacral nerve III (ventral ramus) 22 . Piriformis muscle 23 . Sacral nerve IV 24 . Upper pointer: Inferior gluteal artery Lower pointer: Internal pudendal artery 25 . Nerve to Levator ani muscle 26 . Coccygeus muscle 27 . Levator ani muscle 28 . Anal canal