neuron Definition

a grayish or reddish granular cell that is the fundamental functional unit of nervous tissue transmitting and receiving nerve impulses and having cytoplasmic processes which are highly differentiated frequently as multiple dendrites or usually as solitary axons which conduct impulses to and away from the cell body : nerve cell

interneuron

a neuron that passes from the central nervous system or a ganglion toward a muscle and conducts an impulse that causes movement —called also motoneuron