the plantaris muscle originates from the posterior lateral femoral condyle next to the head of the lateral gastrocnemius muscle.
it lies between the medial gastrocnemius muscle belly and the soleus muscles. it travels obliquely in the calf. the thin tendon inserts into the achilles tendon.
usually a patient will complain that they felt a snap or a feeling that someone kicked them in the back of leg. there can be bruising around the ankle.