Adductor magnus is the largest adductor by volume and uniquely has two distinct parts with different nerve supplies, reflecting its embryological origin from both adductor and hamstring muscle groups. The adductor hiatus is the gap in its distal attachment through which the femoral vessels pass from the anterior to the posterior thigh.
| Origin | Adductor part: ischiopubic ramus; Hamstring part: ischial tuberosity — separate origin |
|---|---|
| Insertion | Adductor part: linea aspera and medial supracondylar ridge; Hamstring part: adductor tubercle of the medial femoral condyle |
| Nerve Supply | Adductor part: obturator nerve (L2, L3, L4); Hamstring part: tibial nerve (L4) — same innervation as hamstrings |
| Blood Supply | Perforating arteries from the profunda femoris |
| Actions | Adducts the thigh — the most powerful adductor; Adductor part: flexes the hip; Hamstring part: extends the hip — acts like a hamstring |
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The adductor hiatus is a key surgical landmark — the femoral artery passes through it to become the popliteal artery. Femoral artery aneurysms and entrapment syndromes at the adductor hiatus are managed through this space. The hamstring portion inserts at the adductor tubercle — the key landmark for medial knee ligament anatomy.
Palpated as the large medial thigh muscle mass during resisted hip adduction.
The adductor hiatus in adductor magnus allowing the femoral vessels to transition from the anterior to the posterior compartment, the reference for femoral vessel entrapment and popliteal aneurysm surgery.
