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Voluntary and Reflex Motor Physiology. The motor (efferent) division of the nervous system includes the somatic (voluntary) motor division and the autonomic. (involuntary) motor division. The somatic motor division involves voluntary or conscious movement of skeletal muscles.
5. The effector, muscle fibers or glands, responds to the efferent impulses by contracting or secreting a product, respectively. Figure 1. Simple reflex arc. Components of all human reflex arcs: receptor, sensory neuron, integration center (one or more synapses in CNS), motor neuron, and effector.owever, most reflexes are more complex and polysynaptic, involving the participation of one or more association neurons in the reflex arc pathway. A three-neuron reflex arc (flexor reflex) is diagrammed in Figure 2b.