Adductor magnus is one of the medial thigh muscles. It originates and inserts as two continuous parts - hamstring and adductor portions. Both adduct the hip.
The hamstring portion arises from inferior part of the ischial tuberosity and inserts into the adductor tubercle of the femur. It is innervated by the tibial portion of the sciatic nerve (L4). Its supplementary action is to extend the hip.
The adductor part arises from the ischiopubic ramus and inserts into most of the length of the linea aspera down to the superior part of the medial supracondylar line of the femur. It is innervated by the posterior division of the obturator nerve (L2-L4). Its supplementary action is to flex and medially rotate the hip.
The divergence of the two sets of muscle fibres along the medial supracondylar line forms the adductor hiatus.