Chapter 5 - Chapter 5 The Nervous System pg 143-176...

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Chapter 5: The Nervous System pg. 143-176 Functional organization of the Nervous System Central nervous system – brain and spinal cord Peripheral nervous system – nerves and neurons Sensory neurons – carry information from sensory organs into the central nervous system Interneurons – carry messages from one set of neurons to another Motor neurons – carry messages out from central nervous system to muscles and glands Cell body – contains cell nucleus and other basic machinery Dendrites – increases surface area of cell to allow for receipt of signals from other neurons Axons – carry electrical impulses called action potentials away from cell Myelin sheath – surrounds axon Axon terminal – ending of axon branch end Neurotransmitter – chemical substance that is released onto a receiving cell Synapse – place where axon terminal passes transmitter molecules to a receiving cell Neuron’s message lies in the number of action potentials that move down the axon and cause the release of transmitter molecules from each axon terminal
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Chapter 5 - Chapter 5 The Nervous System pg 143-176...

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