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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
Bassett Image
Diagram Image
Legend Image
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)