Anatomy study note · Pelvis

Sacroiliac joint

A strong synovial joint between the auricular surfaces of the sacrum and ilium that transmits the weight of the body from the vertebral column to the pelvis.

Key points

• Synovial; auricular surfaces.
• Posterior + interosseous ligaments = main support.
• Sacrotuberous + sacrospinous prevent sacral rotation.
• Softened by relaxin in pregnancy.
• Joint: from mesenchyme between bone ends.
• Synovial cavity forms in the middle layer.
• Synovial membrane: type A (phagocytic) + type B (secretory) cells.
• Joint surfaces: hyaline cartilage, no perichondrium.

The full note in the atlas also covers

Features · Action · Nerve supply · Histology · Development · Clinical notes

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Written from

• Snell’s Clinical Anatomy by Regions, 10th ed., ch. 8, PDF pp. 1028–1030
• Inderbir Singh’s Human Embryology, ch. 10, PDF p. 144
• BRS Cell Biology & Histology, 7th ed., ch. 7, PDF pp. 117–120, 131

More from the pelvis

• Sacrotuberous and sacrospinous ligaments
• Sacrum
• Seminal vesicle
• Sigmoid colon
• Urinary bladder
• Uterine artery
• Uterine tube
• Uterus
• Vagina
• Coccygeus
• Coccyx
• Hip bone

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