Adductor Magnus Innervation

| Nerve | Branch | Portion of Adductor Magnus Innervated | Action | |-------|--------|----------------------------------------|--------| | (L2-L4) | Posterior branch | Adductor (vertical/oblique) fibers | Adduction of thigh | | Sciatic nerve (L4-S3) | Tibial division (via its muscular branches) | Hamstring (transverse/ischiocondylar) fibers | Adduction + hip extension |

The adductor magnus is anatomically divided into two distinct portions: the adductor part (or pubofemoral portion) and the hamstring part (or ischiocondylar portion). The adductor part originates from the inferior pubic ramus and the ramus of the ischium, inserting along the gluteal tuberosity and the linea aspera of the femur. This portion is primarily responsible for adducting and medially rotating the thigh. Because of its location and function, it is innervated by the posterior division of the obturator nerve, which carries fibers from the L2, L3, and L4 spinal nerve roots. adductor magnus innervation

| Feature | Adductor portion | Hamstring portion | |---------|----------------|-------------------| | | Upper, medial (vertical fibers) | Lower, lateral (transverse/oblique fibers) | | Nerve | Obturator nerve (posterior branch) | Sciatic nerve (tibial division) | | Segments | L2–L4 (mainly L3, L4) | L4–S3 (mainly L4, L5) | | Entry surface | Anterior/deep (medial thigh) | Posterior (posterior thigh) | | Primary action | Adduction | Adduction + hip extension | | Clinical loss | Adduction weakness | Adduction + extension weakness | | Nerve | Branch | Portion of Adductor

The clinical significance of this dual supply is profound. In cases of obturator nerve palsy, the patient may lose the ability to adduct the thigh effectively, yet the hamstring portion of the adductor magnus may remain functional due to its sciatic supply. Conversely, injuries to the sciatic nerve may spare the adductor portion, allowing for preserved stability in the medial thigh. Surgeons must also be acutely aware of these nerve paths during procedures like adductor tenotomies or hip replacements to avoid iatrogenic nerve damage. Because of its location and function, it is

The adductor magnus is dually innervated: