Adductor Magnus (Hamstring Part)
Musculus adductor magnus (pars ischiocondylaris)
The ischiocondylar (hamstring) part of adductor magnus originates on the ischial tuberosity and is innervated by the sciatic nerve, so functionally it behaves like a fourth hamstring and is a powerful hip extensor. Because it does not cross the knee, it extends the hip without the knee-position dependence of the true hamstrings. It is heavily recruited in deep hip flexion (bottom of squats and deadlifts) and is a frequently overlooked contributor to hip-extension strength and groin/hamstring injury resilience.
- Actions
- Hip extension, Hip adduction, Medial rotation of the thigh
- Origin
- Ischial tuberosity (the ischiocondylar / hamstring portion arises here, distinct from the pubic-origin adductor portion)
- Insertion
- Adductor tubercle of the medial femoral condyle, via a rounded tendon
- Innervation
- Tibial division of the sciatic nerve (L4-S1) for the hamstring part; the remainder of the muscle is supplied by the posterior division of the obturator nerve
- Blood supply
- Profunda femoris (deep femoral) artery, including perforating and obturator branches
Antagonists Gluteus MediusTensor Fasciae Latae