Sacrospinous ligament

Dr Maxime St-Amant and Dr Henry Knipe et al.

The sacrospinous ligament is a stabiliser of the sacroiliac joint and connects the bony pelvis to the vertebral column

Gross anatomy

The sacrospinous ligament is a triangular-shaped structure with its base attached to the anterior sacrum (S2-S4) and coccyx, and its apex attached to the ischial spine. It forms a boundary of the greater and lesser sciatic foramen


  • anteriorly: coccygeus muscle 3
  • posteriorly: sacrotuberous ligament, crossed by internal pudendal vessels and nerves
  • superiorly: upper margin forms the lower border of the greater sciatic foramen
  • inferiorly: lower margin forms part of lower border of the lesser sciatic foramen
Anatomy: abdominopelvic
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Article information

rID: 29755
Section: Anatomy
Tag: pelvis
Synonyms or Alternate Spellings:
  • Sacrospinous ligaments

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