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Sacrotuberous ligament

Recommended video: Sacrum and coccyx [08:45]
Bony structures and ligaments of the sacrum and coccyx.

The sacrotuberous ligament is a thick fibrous band that extends from the posterior ilium, lateral sacrum and coccyx to the ischial tuberosity. It is formed by the merge of the posterior sacroiliac ligaments and fibers that extend from the posterior margin of the ilium and the base of the coccyx. 

The fibers of the sacrotuberous ligament transform the sciatic notch of the hip bone into a large sciatic foramen. This foramen is further divided by the sacrospinous ligament into greater and lesser sciatic foramina. Along with the ischial tuberosities, pubic arch and coccyx, the sacrotuberous ligament marks the borders of the pelvic outlet (inferior pelvic aperture). 

The main function of the sacrotuberous ligament is to provide stabilization of the sacroiliac joint and to strengthen the connection between the bony pelvis and the vertebral column.

Terminology English: Sacrotuberous ligament
Latin: Ligamentum sacrotuberale
Synonyms: Sacrotuberal ligament
Attachments Proximal: Ilium, sacrum, coccyxDistal: Ischial tuberosity
Function Stabilization of sacroiliac joint, strengthening connection between bony pelvis and vertebral column.

Learn more about the anatomy and ligaments of the sacrum and coccyx with the following study unit: 

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