The Adductor Magnus is the powerhouse of the inner thigh, standing out as the largest and most complex muscle in the medial compartment. Often called the "fourth hamstring," it is a heavy-duty stabilizer that bridges the gap between the front and back of your leg. The Breakdown Dual innervation of adductor magnus - Barrett - Wiley Online Library This would be unusual, as the medial thigh skin over the adductors is jointly supplied by distal branches of the obturator nerve ( Wiley Online Library
Report on the Adductor Magnus Muscle 1. Overview
Name: Adductor Magnus Type: Mixed function muscle (both adductor and hamstring-like) Compartment: Medial thigh (adductor compartment), though its posterior part is often considered part of the hamstring group embryologically and functionally. Innervation: Dual nerve supply (see below). Vascular supply: Deep femoral artery (profunda femoris) and obturator artery.
2. Anatomy Origin The adductor magnus has two distinct heads: | Head | Origin | |------|--------| | Adductor (pubofemoral) head | Inferior ramus of pubis & ramus of ischium | | Hamstring (ischiocondylar) head | Ischial tuberosity | Insertion adductor magnus muscle
Adductor head: Entire linea aspera of femur (medial lip), medial supracondylar line. Hamstring head: Adductor tubercle of femur (medial epicondyle region).
Relationship to Adductor Hiatus
The hamstring part forms the proximal border of the adductor hiatus — an opening in the muscle's distal tendon that allows passage of the femoral vessels from the anterior thigh to the popliteal fossa (becoming popliteal vessels). The Adductor Magnus is the powerhouse of the
3. Innervation | Head | Nerve | Spinal roots | |------|-------|---------------| | Adductor head | Obturator nerve (posterior division) | L2–L4 | | Hamstring head | Tibial nerve (via sciatic nerve) | L4–S1 |
This dual innervation reflects the muscle’s dual embryological origin (anterior vs. posterior division of the limb bud).
4. Function As a large, powerful muscle of the medial thigh, the adductor magnus performs multiple actions depending on which fibers are activated: | Joint | Action | Primary head involved | |-------|--------|------------------------| | Hip | Adduction (strongest adductor of the hip) | Both heads, mainly adductor part | | Hip | Extension (especially from flexed position) | Hamstring head | | Hip | Medial rotation (minor role) | Adductor head | | Hip | Flexion (only when hip is extended, minor) | Adductor head | | Pelvis | Anterior pelvic tilt (via pull on ischium) | Hamstring head (fixed femur) | Overview Name: Adductor Magnus Type: Mixed function muscle
It is a key synergist with hamstrings in hip extension and with gracilis/adductor longus/brevis in adduction.
5. Clinical Significance A. Adductor Magnus Strain ("Groin Pull")