Obturator internus nerve

The nerve to obturator internus is a nerve that innervates the obturator internus and gemellus superior muscles.

Course

The nerve to obturator internus originates in the sacral plexus. It arises from the ventral divisions of the fifth lumbar and first and second sacral nerves.

It leaves the pelvis through the greater sciatic foramen below the piriformis muscle, and gives off the branch to the gemellus superior, which enters the upper part of the posterior surface of the muscle.

It then crosses the ischial spine, reenters the pelvis through the lesser sciatic foramen, and pierces the pelvic surface of the obturator internus.

See also

• Obturator nerve
• Nerve to quadratus femoris

References

This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918)