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Piriformis
Region: Hip & Thigh Muscles · All hip & thigh muscles
Piriformis at a glance
| Origin | Front surface of the sacrum |
|---|---|
| Insertion | Upper border of the greater trochanter of the femur |
| Actions | Rotates the thigh outward; Moves the thigh away from the midline when the hip is flexed |
| Nerve supply | Nerve to piriformis (S1–S2) |
◆ Good to know
The key landmark of the gluteal region: the sciatic nerve usually emerges just below it, and in some people pierces it — a variant implicated in piriformis syndrome.
More Hip & Thigh Muscles
Please note: This page is an anatomy education summary for students and curious readers, not medical advice. Attachment points are given in their classic short form; individual anatomy varies, and detailed dissection-level descriptions belong in an anatomy atlas.