Fig. 1.

Tendon of the plantaris muscle. a Type 1 of plantaris tendon insertion to the calcaneal tuberosity (the most common). Medial view of the right leg. The course of the plantaris muscle tendon visible on the medial part of the calcaneal tendon. b Type 4 of the plantaris tendon insertion (the less common). Posteromedial view of the right leg. The figure shows the atypical insertion of the plantaris tendon to the deep fascia of the leg. The lack of the insertion located on the calcaneal bone is visible. AT Achilles tendon, CT calcaneal tuberosity, PT plantaris tendon