Topic 10 nervous tissue PRSENTATION 2009

Topic 10 nervous tissue PRSENTATION 2009 - Topic 10 Nervous...

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Topic 10. Nervous Tissue General functions of the nervous system Anatomical and functional organization of the nervous system Gross and microscopic anatomy of nervous tissue Neurophysiology Neurotransmitters
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General functions of the nervous system The nervous system is a major control and regulatory system of the body It performs three overlapping functions: sensory input neural integration motor output
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Nervous system is a control system Efferent pathway Afferent pathway
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Anatomy of the Nervous System Nerves, ganglia
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Autonomic Nervous System HR and BP decrease Bronchioles constrict Pupils constrict Digestion is activated Elimination of waste is activated Sympathetic Nervous System Parasympathetic Nervous System HR and BP increase Bronchioles dilate Pupils dilate Glycogen is broken down Target organs: _________
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Nervous tissue Highly cellular, little (< 20% ) extracellular space Has two types of cells 1. Neurons Structural and functional units Amitotic, live long, have high metabolic rate Possess fundamental properties ____________________________________ 2. Neuroglia = glial cells Supportive function Mitotic 10:1 proportion to neurons
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Structure of a Neuron Cell body = soma RER =Nissl bodies most somas are located in CNS Two types of processes 1. Dendrite Short, branched Receive information 2. Axon (nerve fiber) Longer, have telodendria Conduct signal Initial portion is axon hillock with __________ Telodendria have secretory component
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Functional Types of Neurons
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Structural classification of neurons Multipolar Bipolar Unipolar
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Types of neuroglia In PNS Schwann cells Satellite cells In CNS Oligodendrocytes Astrocytes Microglia Ependymal cells
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Schwann cells and oligodendrocytes form the myelin sheath , a whitish layer around a nerve fiber formed from wrappings of plasma membrane Functions 1. ________________________________________________________________ 2. ________________________________________________________________ Nodes of Ranvier Internodes
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How do neurons communicate? How does a neuron generate an electrical signal? How does it transmit the
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This note was uploaded on 06/05/2011 for the course KINS 2531 taught by Professor Sturges during the Spring '11 term at Georgia Southern University .

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Topic 10 nervous tissue PRSENTATION 2009 - Topic 10 Nervous...

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