motor control of the face is the function of the cranial nerve.
motor control of the face is the function of what nerve?
cranial
the spinal component of the accessory nerve provides motor control of the sternocleidomastoid and trapezius muscles. the trapezius muscle controls the action of shrugging the shoulders, and the sternocleidomastoid the action of turning the head. like most muscles, control of the trapezius muscle arises from the opposite side of the brain. contraction of the upper part of the trapezius muscle elevates the scapula. the nerve fibres sternocleidomastoid however are thought to change sides () twice. this means that the sternocleidomastoid is controlled by the brain on the same side of the body. contraction of the stenocleidomastoid fibres turns the head to the opposite side, the net effect meaning that the head is turned to the side of the brain receiving visual information from that area. the cranial component of the accessory nerve, on the other hand, provides motor control to the muscles of the soft palate, larynx and pharynx.
accessory nerve
section::::structure and function.





















































motor nerve fibers transduce signals from the cns to peripheral neurons of proximal muscle tissue. motor nerve axon terminals innervate skeletal and smooth muscle, as they are heavily involved in muscle control. motor nerves tend to be rich in acetylcholine vesicles because the motor nerve, a bundle of motor nerve axons that deliver motor signals and signal for movement and motor control. calcium vesicles reside in the axon terminals of the motor nerve bundles. the high calcium concentration outside of presynaptic motor nerves increases the size of epps (end-plate potentials).





















































section::::protective tissues.
motor nerve