<Tr> <Th> FMA </Th> <Td> 22541 </Td> </Tr> <Tr> <Td_colspan="2"> Anatomical terms of muscle (edit on Wikidata) </Td> </Tr> <P> In humans, the gastrocnemius muscle (/ ˌɡæstrɒkˈniːmiəs / or / ˌɡæstrəkˈniːmiəs /; plural gastrocnemii; Latin, from Greek γαστήρ "stomach" and κνήμη (knḗmē) "leg"; meaning "stomach of leg" (referring to the bulging shape of the calf) is a very powerful superficial bipennate muscle that is in the back part of the lower leg . It runs from its two heads just above the knee to the heel, a two joint muscle . </P> <P> The gastrocnemius is located with the soleus in the posterior (back) compartment of the leg . The lateral head originates from the lateral condyle of the femur, while the medial head originates from the medial condyle of the femur . Its other end forms a common tendon with the soleus muscle; this tendon is known as the calcaneal tendon or Achilles Tendon and inserts onto the posterior surface of the calcaneus, or heel bone . </P>

What is the name of the main muscle that forms the calf