Dissection of male pelvis from a lateral approach
Piriformis muscle and nerve supply, medial view
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Image #173-1
Dissection of male pelvis from a lateral approach
Piriformis muscle and nerve supply, medial view
The right sacral plexus has been resected to permit a view of the piriformis muscle. The nerves to this muscle (19), derived from the first and second sacral nerves and given off from the adjacent part of the sacral plexus, have been preserved.
- Lateral sacral artery (branch of iliolumbar artery)
- Lumbar branch iliolumbar artery
- Lumbosacral trunk
- Upper pointer: Superior gluteal artery Lower pointer: Body of ilium
- Iliolumbar artery (iliac branch of)
- Obturator nerve
- Iliopsoas muscle
- Upper pointer: Obturator artery (entering obturator canal) Lower pointer: Pubic branch of obturator artery
- Body of pubic bone
- Obturator internus muscle
- Ischium
- Superior gluteal vein
- Sacral nerve I (emerging from anterior (pelvic) sacral foramen)
- Ramus communicans
- Sacral nerve II
- Sacrum (body cut through to expose sacral canal)
- Sympathetic trunk
- Sacrum
- Nerve to piriform muscle
- Piriform muscle
- Inferior gluteal artery
- Greater sciatic foramen (piriform muscle passing through)
- Coccygeus muscle
- Coccyx
- Ischial spine
- Nerve to obturator internus muscle