PSYC 100 Lecture Notes - Lecture 4: Peripheral Nervous System, Spinal Cord, Central Nervous System
23 Feb 2016
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Document Summary
Provide structural support & insulation for neurons. Recent studies suggest maybe centrally involve how information is processed. Motor neurons: transmit messages to the muscles that move the body. Sensory neurons: receive information from outside the nervous system. Contains cell nucleus and provides chemical support of cell. Branch-like parts of the neuron that receive information. Long thin fibers that transmit signals away from the cell body to other neurons, muscles/ glands. Small knobs at the end of the axon that secrete neurotransmitters. Junction where neurons interact with one another. Stable, negative charge in the inactive cell of about -70mv. Process during which positively charged sodium (na+) ions flow into the axon making it less negatively charged. Brief change in a neuron"s electrical charge. Electric current that flows along the axon as a result of an action potential. Minimum length of time after an action potential during which another action potential cannot begin. Release or not release an action potential.
