Ligaments and joints of lumbosacral spine and pelvic girdle

Sacroiliac joint opened; interosseous sacroiliac ligament, left lateral view

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Image #156-2

Ligaments and joints of lumbosacral spine and pelvic girdle

Sacroiliac joint opened; interosseous sacroiliac ligament, left lateral view

The left ilium has been detached to display the auricular surface of the sacrum and the interosseous sacroiliac ligaments.

1. Interosseous sacroiliac ligament (pointer indicates only a small part of the area occupied by the numerous bands that comprise these ligaments which have been cut at their attachments to the ilium)
2. Iliolumbar artery
3. Lumbosacral trunk
4. Articular surface of sacrum
5. Ventral sacroiliac ligament
6. Sacral nerve I
7. Piriform muscle (cut across)
8. Spinous process vertebra L. V
9. Supraspinous ligament
10. Interspinous ligament L. V - S. I (convex in shape due to compression by extension of vertebra on sacrum)
11. Middle sacral crest
12. Dorsal sacroiliac ligament (cut across)
13. Iliac branch of iliolumbar artery
14. Area of articular surface in which fibrocartilage has been damaged (remainder of auricular surface intact)
15. Joint capsule (lined internally by synovial membrane)