Muscle Name: Deep Hip External Rotators
Medical Name:
- Piriformis
- Gemellus Superior
- Gemellus Inferior
- Obturator Internus
- Obturator Externus
- Quadratus Femoris
Other Names:
- Deep Lateral Rotators
- Hip External Rotators
Piriformis
Movement:
- Lateral (external) rotation of the hip
- Rotating the thigh outward
- Abduction of the hip (when the hip is flexed)
- Moving the thigh away from the body
Attachment:
- Origin:
- Anterior surface of the sacrum
- Insertion:
- Greater trochanter of the femur
Gemellus Superior
Movement:
- Lateral (external) rotation of the hip
- Rotating the thigh outward
Attachment:
- Origin:
- Insertion:
- Medial surface of the greater trochanter of the femur (via the tendon of obturator internus)
Gemellus Inferior
Movement:
- Lateral (external) rotation of the hip
- Rotating the thigh outward
Attachment:
- Origin:
- Insertion:
- Medial surface of the greater trochanter of the femur (via the tendon of obturator internus)
Obturator Internus
Movement:
- Lateral (external) rotation of the hip
- Rotating the thigh outward
Attachment:
- Origin:
- Internal surface of the obturator membrane and surrounding bones
- Insertion:
- Medial surface of the greater trochanter of the femur
Obturator Externus
Movement:
- Lateral (external) rotation of the hip
- Rotating the thigh outward
Attachment:
- Origin:
- External surface of the obturator membrane and surrounding bones
- Insertion:
- Trochanteric fossa of the femur
Quadratus Femoris
Movement:
- Lateral (external) rotation of the hip
- Rotating the thigh outward
Attachment:
- Origin:
- Lateral border of the ischial tuberosity
- Insertion:
- Intertrochanteric crest of the femur
Related Muscles:
- Gluteus Maximus
- Gluteus Medius
- Gluteus Minimus
- Tensor Fasciae Latae
- Adductor Group
