flexor

noun

Etymology: From New Latin flexor, agent noun of flectō (“to bend”).

1. A muscle whose contraction acts to bend a joint or limb.

   “Starting at the point of shoulder, use muscle squeezings, picking-ups, kneadings and gentle frictions, interspersed with effleurages, over the triceps muscle as well as the fleshy part of the flexor and extensor muscle groups.”