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THE NERVOUS SYSTEM I pp
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FUNCTION network of cells (neurons) that communicate and control the body through electrical impulses Includes neurons (cells that carry messages), brain and spinal cord
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NEURONS
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CENTRAL NERVOUS SYSTEM CNS
Brain – control center with different sections controlling different parts of the body Spinal cord – column of nerve tissue that acts as a communication link between brain and Peripheral NS.
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PERIPHERAL NERVOUS SYSTEM PNS
Carries impulses to and from the CNS. Motor division (reacts to sensory input) 1. Somatic nervous system (voluntary): transmits impulses to and from skeletal muscle (including reflexes)
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2. Autonomic nervous system (involuntary) – controls glands, internal organs, and other smooth muscle tissue (EX. Parasympathetic and sympathetic response)
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TYPES OF NEURONS sensory – sense organs/receptors send stimulus to CNS to process. motor – sends response from CNS to muscles/glands to react. interneurons – connect sensory and motor and carry impulses between them.
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REFLEXES Sensory information does not need to be processed by the brain During a reflex the information is processed in the spinal cord
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