Needle EMG studies of the other muscles (i.e., gastrocnemius,
short head of biceps femoris, and paraspinal muscles) showed normal results.
The
short head of biceps femoris, overlaid and fused with the long head of biceps femoris, forms the lateral border (Figure 3).
Electromyography showed fibrillation potentials and positive sharp waves (denervation potentials) without any voluntary activity in tibialis anterior, extensor hallucis longus, peroneus longus, medial head of gastrocnemius, and
short head of biceps femoris on the right side.