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The Superior Gemellus is a member of the Deep Lateral Rotator Group (also known as the Deep 6), composed of the following six muscles (from superior to inferior):
- Superior gemellus
- Obturator internus
- Inferior gemellus
- Obturator externus
- Quadratus femoris
- The superior gemellus attaches from the pelvic bone to the greater trochanter of the femur.
- The proximal/medial attachment is onto the ischial spine.
- Laterally rotates the thigh at the hip joint.
- Horizontally abducts the thigh at the hip joint.
- Contralaterally rotates the pelvis at the hip joint.
NOTE: A tight superior gemellus can contribute to compression of the sciatic nerve causing symptoms of sciatica. When this occurs, it is called piriformis syndrome.