A branch of the tibial nerve arising in the popliteal fossa, supplying the medial head of gastrocnemius. The medial gastrocnemius branch is the most proximal of the gastrocnemius motor branches and is given off before the tibial nerve passes beneath the soleal arch. It is the dominant gastrocnemius motor branch in terms of muscle mass supplied.
The nerve to medial gastrocnemius is preserved in isolated soleus injuries but lost in high tibial nerve lesions. Its denervation produces asymmetric calf wasting — the medial head atrophies more visibly than the lateral. EMG of the medial gastrocnemius is a standard measure of tibial nerve motor function at the knee level. The branch is at risk in posterior knee approaches and proximal gastrocnemius recessions.
Selective medial gastrocnemius head atrophy from tibial nerve proximal branch injury, producing visible medial calf wasting and reduced plantarflexion endurance, confirmed by EMG needle examination.
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