A flexor directs an appendage forward; an exception is the gastrocnemius in this part of the leg
[DOC] [TLE] Gastrocnemius muscle - Wikipedia [PAR] In humans, the gastrocnemius muscle (/strknimis/ or /strkni
mis/; plural gastrocnemii; Latin, from Greek  "stomach" and  (
knm) "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.