PSY 102 Lecture Notes - Lecture 3: Reticular Formation, Axon Terminal, Somatic Nervous System
3 Oct 2017
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Document Summary
Nerve cells: neurons: cells in nervous system that perceive and transmit information, massively connected together - 85 billion in brain, trillions of connections. Branch like bres that receive information from other neutrons. Axon: tail like part of a neutron that sends information to other neutrons. Receipt and transmission of information electrochemical process. Results in chemical changes in the cell body. Some chemical changes= make electrical charge less negative. Suf ciently less negative (-55 millivolts) = an action potential is generated. Signal quickly travels down axon (300km/h)(i. e res: myelin sheath = around axon of some neutrons is fatty substance that acts as insulation, speeding up transmissions long axon. Multiple sclerosis(motor generate disease, not capable of smooth movements) associated with loss of myelin. Terminal buttons= located at end of axon. Synapse= where terminal buttons meet the dendrites of another neutron (dont actually touch)
