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 By TeachMeSeries Ltd (2025) Fig 1The deep muscles of the gluteal region. By TeachMeSeries Ltd (2025) Fig 2The piriformis as an anatomical landmark in the gluteal region. Pro Feature - 3D Model You've Discovered a Pro Feature Access our 3D Model Library Explore, cut, dissect, annotate and manipulate our 3D models to visualise anatomy in a dynamic, interactive way. Learn More Pro Feature - Dissection Images The sacrotuberous ligament and surrounding structures The sacrotuberous ligament and surrounding structures You've Discovered a Pro Feature Access our Dissection Image Library Enhance your understanding with high-resolution dissection images showcasing real-life anatomy. Learn More Print Article Rate This Article