Anatomy study note · Pelvis

Obturator internus

A muscle of the lateral pelvic wall whose tendon turns round the lesser sciatic notch to reach the femur.

Key points

• Obturator membrane → greater trochanter.
• Exits through the lesser sciatic foramen.
• Nerve to obturator internus.
• Lateral rotator; its fascia gives origin to levator ani.
• 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

Relations · 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. 1021, 1024–1025, 1047
• 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

• Obturator membrane
• Obturator nerve
• Ovary
• Pelvic lymph nodes
• Piriformis
• Prostate
• Pubic symphysis
• Rectum
• Sacral plexus
• Sacrococcygeal joint
• Sacroiliac joint
• Sacrotuberous and sacrospinous ligaments

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