Lecture 4. Biological Bases of Behaviour (I)

Lecture 4. Biological Bases of Behaviour (I) - Introduction...

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Introduction to Psychology PSYC 1001, Section E Wednesday, Oct. 1, 2008 The Biological Bases of Behaviour (Part I, Ch. 3, pp. 76–93)
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Today’s class (Objectives) Communication in the N.S. The Action Potential The Synapse Video: Cerebral Laterality
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A. Communication in the NS Two main types of cells ( “hardware” ): Neurons Carry out the brain’s major functions Enable us to receive info, process it, and act Approximately 80-100 billion Glia Aid and modulate neurons’ activities Approximately 100-120 billion
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I. Nervous tissue Debate in the Early 1900s Golgi The nervous system is composed of a network of interconnected fibers : a “nerve net” Cajal Nervous system is made of discrete cells Neuron Hypothesis: Neurons are the units of brain function
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Nervous tissue Neurons: 3 basic subdivisions Dendrites Receives information from other neurons Soma (Cell body) Contains the nucleus Integrates information Axon Carries information to be passed on to other cells
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Nervous tissue Dendritic Spines Protrusions from a dendrite that greatly increase its surface area
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Nervous tissue Axon Hillock Juncture of soma and axon where the action potential begins
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Nervous tissue Terminal Buttons Knobs at the tip of an axon that convey info to other neuron(s) secrete neurotransmitters!
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Nervous tissue: Info flow Information Flow in a Neuron
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Fig. 3.1. Structure of the neuron. Neurons are the communication links of the nervous system. This diagram highlights the key parts of a neuron, including specialized receptor areas (dendrites), the cell body (soma), the axon fibre along which impulses are transmitted, and the terminal buttons, which release chemical messengers that carry signals
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This note was uploaded on 04/04/2010 for the course 32611 PSYC 1001 taught by Professor Darcylitteljohn during the Fall '08 term at Carleton CA.

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Lecture 4. Biological Bases of Behaviour (I) - Introduction...

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