Anatomy study note · Pelvis

Sacrococcygeal joint

A cartilaginous joint between the last sacral vertebra and the first coccygeal vertebra.

Key points

• Cartilaginous; S5 ↔ Co1.
• Cornua joined by ligaments.
• Flexes and extends; softens in pregnancy.
• Joint: from mesenchyme between bone ends.
• Synovial cavity forms in the middle layer.
• Synarthrosis: immovable. Diarthrosis: synovial, mobile.

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. 1029–1030
• Inderbir Singh’s Human Embryology, ch. 10, PDF p. 144
• BRS Cell Biology & Histology, 7th ed., ch. 7, PDF p. 131

More from the pelvis

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

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