The piriformis is a muscle of the gluteal region in the lower limb. It is an important landmark which divides the gluteal region into an inferior and superior part.
- Attachments: Originates from the anterior surface of the sacrum. The fibres travel inferiorly and laterally through the greater sciatic foramen to insert onto the greater trochanter of the femur.
- Actions: Lateral rotation and abduction of the lower limb.
- Innervation: Nerve to piriformis.
- Blood Supply: Superior and inferior gluteal artery
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