Anatomy study note · Pelvis

Coccygeus

A small triangular muscle forming the posterior part of the pelvic diaphragm behind levator ani.

Key points

• Ischial spine → lower sacrum and coccyx.
• S4, S5.
• Posterior part of the pelvic diaphragm.
• Striated muscle: myotomes + local mesenchyme.
• Nerve supply indicates origin.
• Skeletal muscle: multinucleated, peripheral nuclei, striated.
• Epimysium → perimysium → endomysium.

The full note in the atlas also covers

Origin · Insertion · Action · Nerve supply · Histology · Development

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Written from

• Snell’s Clinical Anatomy by Regions, 10th ed., ch. 8, PDF pp. 1020–1021, 1028
• Inderbir Singh’s Human Embryology, ch. 7, PDF pp. 92, 108–109
• BRS Cell Biology & Histology, 7th ed., ch. 8, PDF pp. 135–144

More from the pelvis

• Coccyx
• Hip bone
• Internal iliac artery
• Internal iliac vein
• Levator ani
• Ligaments of the uterus
• Obturator internus
• Obturator membrane
• Obturator nerve
• Ovary
• Pelvic lymph nodes
• Piriformis

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