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Nerve to Piriformis Muscle (Left)
Nervous System

Nerve to Piriformis Muscle (Left)

Nervus musculi piriformis

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Quick Facts

Origin: Sacral plexus (S1—S2).

Course: Passes directly from the sacral plexus into the piriformis muscle inside the pelvic cavity.

Branches: None.

Supply: Motor innervation to the piriformis muscle.

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Origin

The nerve to piriformis muscle is formed by the posterior divisions of the anterior rami of first and second sacral (S1-S2), and sometimes, the fifth lumbar nerves.

Course

Following its origin from the sacral plexus, the nerve passes directly into the piriformis muscle without leaving the pelvic cavity. The muscle lies on the anterior surface of the sacrum inside the true pelvis.

Branches

There are no named branches.

Supplied Structures

The nerve to piriformis provides motor innervation to piriformis muscle.

Complete Anatomy

The world's most advanced 3D anatomy platform

Complete Anatomy