Bassett Collection Large Image - Lane Medical Library, Stanford University Medical Center

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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 ligaments (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 .	Femoral nerve
4 .	Articular surface 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 .	Median 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)