What is nerve? »Its Definition and Meaning [2019]

According to the Spanish Royal Academy the Nerves are a set of nerve fibers in the form of whitish cord , which drive impulses between the central nervous system and other parts of the body.That is, they are white strings whose origin is in the brain, from there sprout or leave being able to receive sensations while distributing motor impulses throughout the body.The nerves have the particularity of being able to transmit electric waves, which are activated through the sensory stimuli , although mostly nerve impulses have their origin in a neuron and leaves the axon for the other end and it is thanks to the synapse that the transmission reaches another neuron.Each nerve is formed by one or more fascicules of nerve fibers, highlighting that at the same time each of these nerve fibers is conformed by the axon of the neur ona and by cells.

There is a classification of the nerves, thus allowing to indicate that there are two types, on the one hand are the afferent nerves that are characterized by the fact of to be able to transmit sensory signals to the brain through different organs for example through the skin, and on the other hand there are efferent nerves whose function is to move the stimulating signals from the brain reaching the muscles and glands .Although there is another type of classification, according to their origin the nerves can be: cranial nerves (they are those that are born in the bulb or encephalous), spinal nerves (are those born from the spinal cord) and finally those of the sympathetic nervous system .

The nerves according to their function are classified into: sensory nerves or centripetes (its function is to drive the excitations that occur outside to the nerve centers), the sensory nerves (are capable of transmitting stimuli that originate in the sense organs only), the motor nerves (responsible for lead from a secretion from the nerve center to the muscles or glands the movement orders) and finally the mixed nerves (both function as sensory and motor)