Nerve to piriformis
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The nerve to the piriformis muscle arises from the sacral plexus. The nerve branches from the posterior division of the ventral rami of the first and second sacral nerves. The piriformis occasionally receives a branch from the fifth lumbar nerve.
Unlike the majority of nerves that originate from the sacral plexus the nerve to piriformis remains within the pelvic cavity and pierces the anterior surface of the piriformis muscle.
The sciatic nerve is the largest branch of the sacral plexus and at its origin is closely related to the piriformis muscle. The nerve which receives contributions from L4-S3 forms on the anterior surface of the piriformis muscle and leaves the pelvic cavity through the greater sciatic foramen inferior to piriformis.