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Sacrospinous ligament

Recommended video: Bony pelvis [27:56]
Overview of the bony pelvis.

The sacrospinous ligament is one of the two main accessory ligaments of the sacroiliac joint, along with the sacrotuberous ligament. It is triangular in shape and is located deep to the sacrotuberous ligament. It extends from a broad origin along the lateral margins of the sacrum and coccyx and narrows to its attachment on the ischial spine. The coccygeus muscle lies on its deep/pelvic surface, with its fibers often fuse with it. Therefore, the sacrospinous ligament is sometimes referred to as the degenerate component of the coccygeus muscle.

The presence of the sacrospinous ligament, in addition to the sacrotuberous ligament, transforms the greater and lesser sciatic notches into the greater and lesser sciatic foramina. Together, the main function of these two accessory ligaments is to prevent forward tilting of the sacral promontory by anchoring the inferior end of the sacrum to the ischium.

Terminology English: Sacrospinous ligament
: Ligamentum sacrospinale
Attachments Lateral margin of sacrum and coccyx -> ischial spine
Function Prevent forward tilt of sacral promontory and transform greater and lesser sciatic notches into foramina

Learn more about the ligaments of the pelvis with this study unit (and article):

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