According to the Royal Spanish Academy, the Nerves are a set of nerve fibers in the form of a whitish cord, which conduct 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 they sprout or come out being capable of receiving sensations at the same time of distributing motor impulses throughout the body. Nerves have the particularity of being able to transmit electrical waves, which are activated through sensory stimuliAlthough most nerve impulses have their origin in a neuron and leave the axon to the other end and it is thanks to the synapse that the transmission reaches another neuron. Each nerve is made up of one or more bundles of nerve fibers, highlighting that along with this each of these nerve fibers is made up of the axon of the neuron and cells.
There is a classification of nerves, thus allowing to indicate that there are two types, on the one hand there are afferent nerves that are characterized by the fact of being able to transmit sensory signals to the brain through different organs, for example through the skin, and on the other hand there are the efferent nerves whose function is to transfer the stimulating signals from the brain reaching the muscles and glands. Although there is also another type of classification, according to their origin the nerves can be: cranial nerves (they are those that are born in the bulb or the brain), spinal nerves (they are those that are born from the spinal cord) and finally those of thesympathetic nervous system.
The nerves according to their function are classified into: sensory or centripetal nerves (their function is to conduct the excitations that occur outside to the nerve centers), sensory nerves (they are capable of transmitting only stimuli that originate in the organs of the senses), the motor nerves (responsible for conducting movement orders from a secretion from the nervous center to the muscles or glands) and finally the mixed nerves (they function as both sensory and motor)
