Figure 1.

Medial view of a cadaver dissection of the gastrocnemius–soleus junction proximal to the Achilles tendon. Skin, subcutaneous tissue, and superficial fascia are removed. The gastrocnemius and soleus (Sol) muscle fibers are behind each aponeurosis. The gastrocnemius aponeurosis continues for a variable distance inferior to the distal ends of the medial and lateral heads of gastrocnemius to reach its line of attachment to the aponeurosis of the Sol fascicle insertion. The attachment between the aponeuroses of the medial gastrocnemius (MG) and Sol fascicles insertion enlarges on the bottom-right corner. Blue and pink lines correspond to locations where the myotendinous junction occurred and where the membrane thickness of the aponeurosis was measured using microscopy.