The nerve to sartorius arises from the femoral nerve in the femoral triangle, entering the sartorius on its deep surface near the proximal muscle. It is one of the first femoral nerve motor branches, arising before or at the inguinal ligament.
The nerve to sartorius is a key localising landmark in femoral nerve injury — its preservation indicates a lesion below the inguinal ligament (femoral triangle level), while its loss indicates a lesion at or above the inguinal ligament. Sartorius EMG is routinely performed in femoral nerve injury assessment for this reason. Sartorius is also the muscle surrounding the saphenous nerve in the adductor canal.
Preserved sartorius EMG with absent quadriceps function localises the femoral nerve lesion to the mid-femoral triangle distal to the sartorius branch, predicting a more favourable prognosis than lesions at inguinal ligament level.
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