motor nerve n.
An efferent nerve conveying an impulse that excites muscular contraction.
noun, Cell Biology, Physiology. 1. a nerve cell that conducts impulses to a muscle, gland, or other effector. motor neuron n. A neuron that conveys impulses from the central nervous system to a muscle, gland, or other effector tissue.
- Motor neuron disease
motor neuron disease n. Any of various diseases of motor neurons, such as progressive muscular atrophy, amyotrophic lateral sclerosis, progressive bulbar paralysis, and primary lateral sclerosis.
- Motor neurone disease
noun 1. a progressively degenerative disease of the motor system causing muscle weakness and wasting
- Motor nuclei
motor nuclei pl.n. See nuclei of origin.