ANATOMY

Detailed explanation-1: -A motor neuron is a nerve cell that transmits impulses from the brain or spinal cord to a muscle or gland. A relay neuron connects sensory and motor neurons and is found in the brain or spinal cord (see diagrams 14.1 and 14.2).

Detailed explanation-2: -Neurons are the nerve cells that transmit impulses. Supporting cells are neuroglia. The three components of a neuron are a cell body or soma, one or more afferent processes called dendrites, and a single efferent process called an axon. The central nervous system consists of the brain and spinal cord.

Detailed explanation-3: -Motor or efferent neurons transmit impulses from the central nervous system towards the effectors (muscle or glands), while sensory neurons transmit impulses from the sense organs towards the central nervous system (brain and spinal cord).