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Summary of Nervous System

The central nervous system (CNS) controls the functions of all tissues of the body. The peripheral nervous system receives thousands of sensory inputs and transmits them to the brain via the spinal cord. The brain processes this incoming information and discards 99% as unimportant.

The CNS consists of the brain and the spinal cord, the two parts of the body that contain the vast majority of nerves. The bones of the vertebrae protect the spinal cord; and the bones of the skull, which are corrugated much like an egg carton and serve to absorb impact, protect the brain The features of the human nervous system, including the complexities of the human brain, sometimes make it difficult to predict the exact reaction of a particular patient to a given drug. When a drug is used to affect the nervous system, the Occurrence of many systemic effects is always a possibility because the nervous system affects the entire body.