Caption: Pull out from a human brain to reveal the entire nervous system; highlight the central nervous system, then the peripheral nervous system. The central nervous system has not only the brain but the spinal cord, an approximately eighteen inches long, three-quarter inch thick bundle of nerve tissue extending from the lower part of the brain down through the spine. The spinal cord serves as the main communications throughway of the nervous system. Together, the brain and spinal cord comprise what's called the central nervous system, or CNS. The other major component of the nervous system is the peripheral nervous system, or PNS, with its elaborate network of nerves that relay messages back and forth to and from the brain and every organ in the body without this two-way transmission of information, homeostasis would not be possible, nor would the activation of muscles and glands, or even sensory input. Consider this scenario: you accidentally touch a hot skillet on the stove. In a fraction of a second, the nerves in your skin shoot a message of pain to your bra'ch, in turn, sends a message back, telling the muscles in your hand to pull away.

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Keywords: brain, central nervous system, nerve, nervous system, peripheral nervous system

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Human Brain, Nervous System

K005/0613 Rights Managed

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Duration: 00:00:25.07

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