Sacrospinous ligament

The sacrospinous ligament is a narrow ligament attached to the ischial spine and the lateral region sacrum and coccyx. It borders the sacrotuberous ligament, and shares fiber space with this ligament. The sacrospinous and sacrotuberous ligaments work together to stop ilium rotation while allowing posterior rotation. The sacrospinous and sacrotuberous ligaments are most notably stressed when a person leans forward or stands up. This pair of ligaments converts the greater and lesser sciatic notches into the greater and lesser sciatic foramens. This conversion occurs based on the boundary effect caused by upper and lower placement of the ligaments in proximity with the notches. Several blood vessels, arteries and nerves surround this ligament, including the pudendal vessels, the inferior gluteal artery, the pudendal nerve, the sciatic nerve. When ligaments in the pelvis and the surrounding tissue support become relaxed or absent in females, the sacrospinous ligament delivers a constant support for the fixation inside the vaginal apex. This is referred to as sacrospinous suspension.
Written and medically reviewed by the Healthline Editorial Team
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In Depth: Sacrospinous ligament

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