VARIED VESTIGIAL MYSCLE. “The plantaris muscle and tendon may be regarded as the vestigial remains of a primitive flexor muscle of the toes, which, originally continuous with the plantar aponeurosis, later was rendered discontinuous through intermediate attachment to the calcaneum. The plantaris muscle and its tendon are subject to considerable variation in both the points of origin and of insertion. In an examination of 150 lower extremities, the authors have encountered four types of insertion of the tendon.”
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