Adductor part of adductor magnus

The adductor part of adductor magnus forms the anterior portion of this large composite muscle in the medial compartment of the thigh. It acts primarily as a powerful adductor of the hip joint, and, together with the ischiocondylar (hamstring) part, constitutes the largest muscle of the medial thigh.

Origin

The muscle arises from the outer surface of the inferior pubic ramus of pubic bone and the ischial ramus; it is functionally considered as a muscle of the medial compartment of the thigh.

Insertion

Into the gluteal tuberosity, the middle third of the linea aspera, and the medial supracondylar line of the femur.

Innervation

This part is responsible for adduction of the thigh and is innervated by the obturator nerve. This part is anatomically distinct from the ischiocondylar part (hamstring part), which is involved in hip extension and is innervated by the sciatic nerve.

The adductor minimus represents the superiormost fibers of adductor part of adductor magnus and not a distinct separate muscle.

The adductor part of the adductor magnus is further subdivided into regions based on the locations of the perforating arteries and the adductor hiatus. Specifically, the regions AM1, AM2, and AM3 correspond to the adductor part, with AM1 being solely innervated by the obturator nerve, while AM2 and AM3 receive dual innervation from both the obturator and sciatic nerves.[1] This dual innervation is particularly notable in AM3, where it occurs in over 90% of cases.