Origin

Ischiopubic ramus & obturator membrane

Insertion

Medial aspect of the Greater trochanter

Action(s)

Abducts & rotates laterally thigh, and stabiliser of the hip during walking

Nerve Supply

Nerve to obturator internus (L5, S1)

Arterial Supply

Superior gluteal artery

Physical Exam

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Clinical Importance

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Disease States

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Discussion

Bursa/Bands:

This bony surface is covered by smooth cartilage, which is separated from the tendon by a bursa, and presents one or more ridges corresponding with the furrows between the tendinous bands.

These bands leave the pelvis through the lesser sciatic foramen and unite into a single flattened tendon, which passes horizontally across the capsule of the hip-joint, and, after receiving the attachments of the gemelli, is inserted into the forepart of the medial surface of the greater trochanter above the trochanteric fossa.

A bursa, narrow and elongated in form, is usually found between the tendon and the capsule of the hip-joint; it occasionally communicates with the bursa between the tendon and the ischium.

Figures

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Credits:

From Wikipedia:
Obturator internus

Attachments:


Obturator internus.png (image/x-png)