afferent neuron

The Ear is the sense organ which enables sound waves to so act upon afferent neurons as to excite impulses in them.

This, the intermediate division, may be composed of mon-axonic neurons, or it may consist of branches from the afferent neurons.

Sense Organs.—The sense organs are not parts of the afferent neurons, but are structures of various kinds, in which the neurons terminate.

They may be stimulated by impulses either from the intermediate neurons, or from branches of the afferent neurons.

The first convey impulses to the cord and are called afferent neurons;102 the second convey impulses from the cord and are known as efferent neurons.