Ligaments and joints of lumbosacral spine and pelvic girdle

Sacroiliac joint opened; interosseous sacroiliac ligament, left lateral view

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Image #215-7
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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)