There are two kinds of cells that make up nervous tissue in the body: glia and neurons. Neurons are the information meting out cells. They converse with one another through chemical and electrical means. Electrical contact in the nervous system is accomplished through ‘action potentials’. Action potentials are transformed into a compound message at the synapse, which is the spot where two diverse neurons correspond with one another.
On the other hand, as Dr. Curtis Cripe Glia says, are the supporting cells. There are many diverse types of glia, all of which have dissimilar functions. For instance, glia identified as oligodendrocytes facilitate insulate neuronal axons so that electrical communication in the spinal cord and brain is efficient and fast. Another type of glia, astroctyes are accountable for guaranteeing the blood brain barrier. They also retain the veracity of the chemical situation around neurons. Another kind of glia, ependymal cells, lines the fluid filled cavities or ventricles of the brain. It is significant to understand that there are other sorts of glia with significant functions.
When people combine many millions of glia and neurons into structural units, they arrive at the foundation for defining the nervous system at a macroscopic intensity.
The nervous system is generally divided into two diverse divisions depending on anatomical location. These divisions are the peripheral nervous system (PNS) and the central nervous system (CNS).
CNS: Brain and Spinal Cord
The CNS is made up of the spinal cord and brain. Further, the brain is sub-divided into diverse parts. For instance the sub-cortex, cortex, cerebellum, and brainstem are all measured parts of the brain, and consequently parts of the CNS. The spinal cord is the other part of the CNS. The cord obtains information from the brain and then sends it to the suitable body cells. It also obtains information from the body, which is transmited back to the brain for explanation. The cord is bordered by the same defensive layers as the brain. It is also sheltered by bony structures identified as vertebrae. Once neural information leaves the cord and penetrates the proper body it is now in the PNS.
PNS: Somatic and Autonomic Divisions by Dr. Curtis Cripe
Similar to the CNS, the PNS also has a number of diverse components. The foremost chief division of the PNS is the somatic system. The somatic division consigns to all the nerves that innervate skeletal muscle, in addition to the sensory nerves that send message back to the CNS. The second constituent of the PNS is the autonomic division. The autonomic nervous system can be supplementary divided into sympathetic and parasympathetic sections.
According to Dr. Curtis Cripe, the sympathetic nervous system is accountable for stimulating the body. When your heart races, pupils expand, or respiratory rate amplifies due to a stressor it is because of the sympathetic nervous system. The parasympathetic section can be thought of as the reverse of the sympathetic system. It is accountable for the break and digests functions of the body. The parasympathetic division generally controls the memories and general state of the body at rest.