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Nervous_system - NERVOUS SYSTEM NERVOUS SYSTEM COMPONENTS...

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NERVOUS SYSTEM
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NERVOUS SYSTEM COMPONENTS Brain Cranial nerves Spinal cord Spinal nerves Ganglia - cell bodies of neurons outside brain & spinal cord enteric plexuses Sensory receptors
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NERVOUS SYSTEM ORGANIZATION Central Nervous System - thought, emotion, brain memory spinal cord Peripheral Nervous System (PNS) Somatic (SNS) - voluntary Autonomic (ANS) - involuntary
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Subdivisions of the Nervous System
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AUTONOMIC NERVOUS SYSTEM Sensory Motor - sympathetic - parasympathetic
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Subdivisions of Nervous System
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NERVOUS SYSTEM FUNCTIONS Sensory Integrative Motor Concerned with homeostatic regulation
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NERVOUS TISSUE Neurons - conduct impulses Neuroglia - do not conduct impulses
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NEURON DIVERSITY Sensory (afferent) neurons Transmit information from receptors to the brain or spinal cord (CNS) Interneurons (association neurons) Located in the CNS process, store & retrieve information Motor (efferent) neuron send signals from the CNS to muscles & gland cells (effectors)
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INTERNEURONS (90% of neurons) Located only in the CNS Purkinje cells in cerebellum Renshaw cells in spinal cord Pyramid cells in brain
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NEURON DIVERSITY Multipolar – has several dendrites Bipolar – has one main dendrite & one axon Unipolar - axon & dendrite fuse into a single process Anaxonic – has several dendrites but no axon
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Neuron Diversity
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