Anatomy study note · Pelvis

Sacrotuberous and sacrospinous ligaments

Two strong ligaments of the back of the pelvis that stabilize the sacrum and convert the sciatic notches into foramina.

Key points

• Sacrotuberous → ischial tuberosity; sacrospinous → ischial spine.
• Convert the sciatic notches into greater and lesser sciatic foramina.
• Stop the sacrum rotating under body weight.
• Connective tissue: from leftover mesenchyme.
• Ligament/tendon: dense regular CT — parallel collagen bundles.

The full note in the atlas also covers

Features · Action · Histology · Development

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Written from

• Snell’s Clinical Anatomy by Regions, 10th ed., ch. 8, PDF pp. 1022–1024
• Inderbir Singh’s Human Embryology, ch. 7, PDF pp. 94–95
• BRS Cell Biology & Histology, 7th ed., ch. 6, PDF pp. 110–111

More from the pelvis

• Sacrum
• Seminal vesicle
• Sigmoid colon
• Urinary bladder
• Uterine artery
• Uterine tube
• Uterus
• Vagina
• Coccygeus
• Coccyx
• Hip bone
• Internal iliac artery

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