If we look at the afferent meaning, it refers to the neurons which carry the signals toward the central nervous system. The main function of the afferent neurons is to convert the external stimuli into the internal electric impulse, which travels along with the afferent nerve fiber until it reaches the central nervous system. Sensory perception, like smell, taste, light, hearing and touch, comes from the nose, tongue, eyes, ears and skin and provides the information to afferent neurons. For example, in the case of light, the sensory signals are gathered from the cone cells and rod of the eye’s retina, and then these nerve impulses are carried by the efferent neurons of the eyes to the brain. On the other hand, the afferent neurons of the nose are stimulated by smell, and they carry the nerve impulse to the brain.