Bassett Collection of Stereoscopic Images of Human Anatomy
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Exploration of gluteal region and hip
Intrapelvic portions of obturator internus and piriformis muscles, medial view
Image #181-3
KEYWORDS: Muscles and tendons, Peripheral nervous system.
Creative Commons
Stanford holds the copyright to the David L. Bassett anatomical images and has assigned Creative Commons license Attribution-Share Alike 4.0 International to all of the images.
For additional information regarding use and permissions, please contact Dr. Drew Bourn at dbourn@stanford.edu.
Exploration of gluteal region and hip
Intrapelvic portions of obturator internus and piriformis muscles, medial view
The pelvic contents have been removed and the sacral plexus on the right side has been cut away to expose the piriformis muscle. The nerves to the piriformis (19), derived from the first and second sacral nerves, have been preserved. The obturator internus (10) has also been dissected with its nerve supply. The insertions of both muscles are visible in the dissections illustrated in views 180-4 and 181-4.
- Lateral sacral artery (branch of Iliolumbar artery)
- Lumbar branch of iliolumbar artery
- Lumbosacral trunk
- Upper pointer: Superior gluteal artery Lower pointer: Body of ilium
- Iliolumbar artery (iliac branch)
- Obturator nerve
- Iliopsoas muscle
- Upper pointer: Obturator artery (entering obturator canal) Lower pointer: Pubic branch of obturator artery
- Body of pubis
- Obturator internus muscle
- Ischium
- Superior gluteal vein
- S1 nerve (emerging from posterior sacral foramen)
- Ramus communicans
- Sacral nerve II
- Sacral bone (body cut through to expose sacral canal)
- Sympathetic trunk
- Sacral bone
- Nerve to piriform muscle
- Piriform muscle
- Inferior gluteal artery
- Greater sciatic foramen (piriform muscle passing through)
- Coccygeus muscle
- Coccyx bone
- Ischial spine
- Nerve to Obturator internus muscle