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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.

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Piriformis Muscle

ScienceDirect image

The piriformis muscle arises as a series of segments on the deep surface of the sacrum and exits the sciatic notch to attach to the medial aspect of the greater trochanter.

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