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Plantaris Tendon

Medically reviewed by: Stephanie Curreli, MD, PhD
Last Updated: Jun 19, 2015

The plantaris tendon inserts the plantaris muscle at the calcaneus’ posterior surface. This plantaris muscle is a weak flexor of the leg at the knee joint and a plantar flexor of the foot at the ankle joint. It is a rudimentary muscle, which is sometimes compared to the one in the forearm (see palmaris longus).