1Listen to the audio lecture while viewing these slides1Psychology 372Physiological PsychologySteven E. Meier, Ph.D.Neuronal ClassificationSystems2Psyc 372 – Physiological PsychologyNeuron Classification Systems1. Number of Processes2. Function3. Speed4. Nucleus to Cytoplasmic RatioMinor Systems• Type of NT secreted by Neuron• Effects of NT (excitatory vs. inhibitory)3Psyc 372 – Physiological PsychologyNumber of Processes• Unipolar: one stalk that splits into two branches• Bipolar: one axon, one dendritic tree• Multipolar: one axon, many dendriticbranches4Psyc 372 – Physiological PsychologyUnipolar5Psyc 372 – Physiological PsychologyBipolar - Unipolar Neurons6Psyc 372 – Physiological PsychologyMultipolar27Psyc 372 – Physiological PsychologyFunction• Afferent (Sensory)• Gets information from receptors and sends to CNS• Internuncial (Interneurons)• Connects Afferent neurons to Efferent Neurons• Located in Spinal Cord• Efferent (Motor)• Gets information from CNS and sends to muscle cells8Psyc 372 – Physiological PsychologyTo B r ai nAfferentEfferentInternuncialFunction9Psyc 372 – Physiological PsychologyConduction Speed - Glasser• Type A Fastest 120 m/sec = 270mphSize – 1-20 microns across Axon HillockHeavily Myelinate dFa irly large in humansConcerned with Pain• Type B Mod. Fast 3-15 m/sec Size - < 3 M icrons across Axon HillockMye lina ted•Type C Slow .6 –2 m/secSize - .3-1.3 microns across Axo n HillockNon MyelinatedConcerned w ith dull or throbbing painPain that lasts a long time10Psyc 372 – Physiological PsychologyNucleus to Cytoplasmic RatioRatio o f nucleus size to surrounding cytoplasmNucle usStelate CellsLg. NucleusLittle cytoplasmPyramidal CellsLittle nucleus Lg. cytoplasm11Psyc 372 – Physiological PsychologyMinor Schemes• Type of NT secreted by Neuron•Dopamine•GABA• Effects of Neurotransmitters•Excitatory (EPSP)• Inhibitory
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