- Inner surface of the superior greater trochanter of the femur
- External rotation of hip when in extension
- Abduction of hip when in flexion
- Stabilizes Femur in acetabulum
- Superior Gluteal Artery
- Inferior Gluteal Artery
- Internal Pudendal Artery (gemellar branches)
- Piriformis Nerve (S1-S2)
- Also referred to as 'nerve to piriformis'
- Beaton et al cadaveric study
- 90% of cadavers had traditional anatomy with an undivided sciatic nerve emerging below the piriformis muscle
- Divided sciatic nerve passing through and below the piriformis muscle
- Divided sciatic nerve passing above and below the piriformis muscle
- Undivided nerve passing through the piriformis muscle
- Smoll et al systematic review and meta-analysis
- 16.9% of cadavers: abnormal relationship between the sciatic nerve and piriformis muscle
- Bartet et al MRI study
- 19.2% of MRI revealed an abnormal relationship between the sciatic nerve and piriformis muscle
- Beaton LA, Anson BJ. The sciatic nerve and the piriformis muscle: their interrelation a possible cause of coccygodynia. J Bone Joint Surg. 1938;20(3):686‐688.
- Smoll NR. Variations of the piriformis and sciatic nerve with clinical consequence: a review. Clin Anat. 2010;23(1):8‐17.
- Bartret AL, Beaulieu CF, Lutz AM. Is it painful to be different? Sciatic nerve anatomical variants on MRI and their relationship to piriformis syndrome. Eur Radiol. 2018;28(11):4681‐4686.