Central Nervous System Essay

1214 Words Jul 17th, 2009 5 Pages
The central nervous system (CNS) is that portion of the vertebrae nervous system that is composed of the brain and spinal cord. Together with the peripheral nervous system (PNS), the other major portion of the nervous system, the CNS coordinates the body's interaction with the environment. The CNS is contained within the dorsal cavity, with the brain in the cranial subcavity (the skull), and the spinal cord in the spinal cavity (within the vertebral column).
Then human nervous system is the most complex object know to science, as it includes the intricate CNS and a brain with 10 billion neurons and many times more interneural connections (Anissimov 2007). For some people, this brain and the increase in intelligence it signifies is what
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Prominent components in a nervous system include nuerons (nerve cells) and nerves. Neurons are typically composed of a soma, or cell body, a dendritic tree, and an axon. The large majority of what are commonly called nerves (which are actually bundles of axonal processes of nerve cells) are considered to be PNS.
The nerves that pass through the spinal cord, and nerves from the PNS, provide sensory input to the brain, which processes the information and initiates responses. The spinal cord serves as the main route for the movement of sensory information to and from the brain (Chamberlin and Narins 2005). Information flows to the CNS from the PNS, which senses the internal and external environment, and the response of the brain flows to the various organs and tissues by means of the spinal cord nerve network (Chamberlin and Narins 2005).
The brain and spinal cord are covered by three layers of meninges, which are membranes of connective tissue. The meninges protect and nourish the neural tissue. Between the layers of meninges is an extracellular fluid called the cerebrospinal fluid.
The brain is divided into the three major regions of the forebrain (prosencephalon), the midbrain (mesencephalon), and the hindbrain (rhombencephalon). The brain also has internal cavities (ventricles), which are filled with cerebrospinal fluid and connect with the spinal cavity.
The spinal cord is a long column of neural tissue, extending from the brain downward through a

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