Discussion of the anatomy and function of the efferent (motor) and afferent(sensory) nerves. The anatomy of a motor neuron, along with the function of the dendrites, soma, axon, nodes, myelin sheath, and terminal branches described using a diagram. The function of a sensory nerve also outlined. The Autoimmune disorder of multiple sclerosis presented using the symptoms associated with the myelin sheath destruction which occurs along a motor or sensory nerve fiber. Motor nerves carry an impulse from the CNS to a muscle or gland, while sensory nerves transmit an impulse from a receptor to the CNS. The affects of non communication of both types of nerves is demonstrated by the symptoms produced.