PSYC 101 Chapter Notes - Chapter 3: Neuroglia, Cerebrospinal Fluid, Sympathetic Nervous System
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PSYC 101 Full Course Notes
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100 billion cell with ~160 trillion connections among them. Much smaller than neuron, but 10 times more numerous than neurons. Essential for myelinization of neurons, blood-brain barrier, repair, removal of debris, etc. Neurons - individual cells in the nervous system that receive, integrate, and transmit info. Mostly communicate btw neurons, sometimes to/from muscle. Soma (cell body) - contains the cell nucleus and much of the chemical machinery common to most cells (make proteins, replenishes molecules vital to cell function, the engine/factory supporting the neuron) Dendrites - the parts of a neuron that are specialized to receive info. (receive info. ) Axon - a long, thin fibre that transmits signals away from the soma to other neurons or to muscles or glands. (transmitting portion) Myelin sheath - insulating material, derived from glial cells, that encases some axons. (speed up the transmission) Terminal buttons - small knobs that secrete chemicals called neurotransmitters. (messengers)
