Introduction: The superior gemellus muscle is a lateral rotator of the thigh, functioning together with other muscles of the region such as the piriformis muscle. The sciatic nerve is the largest nerve of the human body. It arises from the lumbosacral plexus and divides into two nerves: the tibial and common fibular nerves, which normally appear near the apex of the popliteal fossa. It is responsible for the innervation of the muscles of the posterior compartment of the lower limb. Case report: We report a doubled superior gemellus muscle associated with a high division of the sciatic nerve on the left side of a cadaveric specimen. The other muscles of the region showed no abnormality. Conclusion: This variation may offer information to piriformis muscle syndrome and be of importance in radiology and surgery of the region.