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Anatomy And Physiology Of The Nervous System

815 words - 3 pages

The nervous is considered to be the master controlling the systems of the body. The way it does this is to communicate through nervous impulse which is very rapid and very specific. The nervous system consist of the peripheral nervous system (PNS) and central nervous system (CNS). The peripheral nervous system consists of the cranial nervous, spinal nerves and ganglia. The peripheral nervous system can also be broking down into two categories which are somatic nervous system and parasympathetic system. On the other hand the central nervous system includes the brain and spinal cord. (fleming-Mcphillips, 2011)

The nervous systems also consist of neurons which are a nerve cell that carries out the functions of the nervous system by sending and receiving impulses. Another neuron that I have learned about would be motor neurons these neurons are very important because they help muscles to contract and gland secretion, these motor neurons are also known as efferent nerves. The efferent neurons give impulses from the neural cell body to the target muscle or organs. Motor neurons also have a process called the axon and dendrites that extend away from it in vary directions. Neurons usually have several dendrites and only one axon. (fleming-Mcphillips, 2011)

The axon is covered in a fatty insulting substance called the myelin sheath. Axon can be several feet long and can reach from the cell body to the area being activated. Dendrites are like tree branches that are unsheathed. Another neuron that’s in the nervous system is the sensory nerve also referred as afferent nerves. This neuron transfer sensory information through the peripheral process. This is the process where impulses are sent to the central nervous system. (fleming-Mcphillips, 2011)

Another thing the nervous system contains is nerve fibers, nerves and tracts. The nerve fibers are a single elongated process the nerve fibers found PNS are wrapped in protective membranes called sheaths. The nerves are a bundle unit of nerve find outside the (CNS). Tract is a group of nerve fibers within the CNS it is also referred to as a tract. Another part that is connected to the nervous system is the brain which is considered the largest mass of the nervous tissue in the body. (fleming-Mcphillips, 2011)

The brain is has three membranes which are also known as meninges these include the pia mater, the arachnoids, and the dura mater. The brain is divided into the cerebrum, the diencephalon, and brainstem. The brainstem consists of the midbrain and hind brain which is further divided into...

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