extrinsic muscles

ex·trin·sic mus·cles

muscles that arise outside of, but act on, the structure under consideration. For example, those muscles operating the hand but having fleshy bellies located in the forearm.
References in periodicals archive ?
Although the calves are the largest muscle group acting on the ankle joint when the foot is pointed, it's the underused intrinsic and extrinsic muscles of the feet that need to be engaged in order to access your full range of motion.
They stabilize the toes and joints to allow the extrinsic muscles, which originate in the leg and insert in the foot, to propel the body forward.
Stability to the joint during activity is provided primarily by the intrinsic and extrinsic muscles of the thumb.
Tendonitis is often seen in the extrinsic muscles of the wrist consisting of the wrist flexors and extensors.
The median innervated intrinsic muscles and all extrinsic muscles were not affected.
The extrinsic muscles connect these cartilages with other structures in the head and neck.
Muscles similar in structure and position could be identified in nauplii from the two raxa, but different origins of extrinsic muscles were evident.
The extrinsic muscles in the forearm provide the major power of the hand.