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Laboratory 44. The Male Pelvis
Step 11. The Posterolateral Pelvic Wall

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Identify the structures on the posterolateral wall of the pelvis:
  • piriformis muscle
  • pelvic portion of the sympathetic trunk
  • lumbosacral trunk from the lumbar plexus which descends into the pelvis medially to the psoas major muscle
  • anterior primary rami of the sacral nerves

Attempt to identify the pelvic splanchnic (parasympathetic) nerves that arise from the ventral primary rami of S2-S4 and pass to the pelvic viscera. The sacral splanchnic (sympathetic) nerves arise from the sacral ganglia of the pelvic portion of the sympathetic trunk.

Links and References:
Grant's: 3.33, 3.34
Netter (1ed.): 384 (2ed.): 380
Rohen/Yokochi: 324, 325