Biological Bases - Copyright Harrison 2009 BIOLOGICAL BASES...

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Copyright, Harrison 2009 1 1 BIOLOGICAL BASES OF BEHAVIOR “NEUROSCIENCE” 2 THE NEURONAL DOCTRINE Ramon y Cajal • NEURON BASIC UNIT OF THE NERVOUS SYSTEM 100 + BILLION – HUMAN BRAIN LENGTH: WHALE: UP TO 30 FEET LONG HUMAN: 1.5 FEET 3 A Motor Neuron From Myers, 1992
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Copyright, Harrison 2009 2 4 The Neuronal Doctrine Neuron = Basic Unit of the Nervous System Alzheimer’s A to D All or None 5 Photograph of Neuron (Simon & Schuster,1989) 6 Neuron & Glial Cells Electron Microscope Magnified 20,000 Times Seymour Simon, 1997
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Copyright, Harrison 2009 3 7 Synaptic Buttons Electron Microscope Seymour Simon, 1997 8 HOW DO NEURONS COMMUNICATE? I. GRADED POTENTIALS 1. EXCITATORY (+) = EPSP DEPOLARIZE CELL 2. INHIBITORY (-) = IPSP HYPERPOLARIZE CELL II. ACTION POTENTIALS “ALL OR NONE” 9 AXON MEMBRANE
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