The gastrocnemius - named from Greek terms meaning the belly, and the calf, because it forms the enlargement of that part of the leg - is double-headed, each head consisting of a fusiform muscle, the lower part of which blends with its fellow so as to form a common tendon of insertion. It forms the femoral origin of the great triceps feurae muscle.
The plantaris (french : muscle plantaire) - named from its occasional attachment to the fascia covering the sole of the foot (=planta)- is a fusiform, somewhat flattened muscle with a very long ribbon- shaped tendon.
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