Essay On Central Nervous System

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The central nervous system (CNS) is the division of the nervous system that is located within the skull and spine. The peripheral nervous system (PNS) is the division that is located outside the skull and spine. The central nervous system is composed of two divisions: the brain and the spinal cord. The brain is the part of the CNS that is located in the skull; the Spinal Cord is the part that is located in the spine. The Peripheral nervous system is also composed of two divisions: The Somatic nervous system and the autonomic nervous system. The somatic nervous system (SNS) is the part of the PNS THAT INTERACTS WITH THE EXTERNAL ENVIRONMENT. It is composed of Afferent nerves that carry sensory signals from the skin, skeletal muscles, joints, eyes, ears, and so on to the central nervous system, and the Efferent nerves that carry motor signals from the central nervous system to the skeletal muscles.…show more content…
These swellings ultimately develop into the five divisions of the adult brain. An interesting part of the myelencephalon from a psychological perspective is the (Reticular Formation), The reticular formation plays a role in arousal. Also, including sleep, attention, movement, the maintenance of muscle tone, and various cardiac, circulatory, and respiratory reflexes. (Pinel, John P. J.) The (Metencephalon), has many descending tracts and part of the reticular formation. These structures create a bulge, called the (Pons), on the brain stem’ ventral surface. The Pons is one major division of the Metencephalon; the other is the cerebellum called (the little brain). The cerebellum is the large convoluted structure on the brain stem’s dorsal surface. It is an important sensorimotor structure; cerebellar damage eliminates the ability to precisely control one’s movements and to adapt them to changing

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