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Organization of The Nervous System

Organization of The Nervous System. Peripheral Nervous System. Central Nervous System. Somatic Nervous System. Autonomic Nervous System. Sympathetic. Parasympathetic. Autonomic Nervous System. Can be divided into: Sympathetic Nervous System “Fight or Flight”

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Organization of The Nervous System

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  1. Organization of The Nervous System Peripheral Nervous System Central Nervous System Somatic Nervous System Autonomic Nervous System Sympathetic Parasympathetic

  2. Autonomic Nervous System • Can be divided into: • Sympathetic Nervous System • “Fight or Flight” • Parasympathetic Nervous System • “Rest and Digest”

  3. Anatomy of ANS

  4. Parasympathetic

  5. Sympathetic

  6. Parasympathetic nervous system SLUDGE Salivation, Lacrimation, Urination, Digestion, gastrointestinal cramps, emesis Most active in non-stressful situations Concerned with keeping body energy use low

  7. Sympathetic nervous system The sympathetic division is the “fight-or-flight” system Involves E activities – exercise, excitement, emergency, and embarrassment Non-essential activities are dampened (GI/urinary) Promotes adjustments during exercise – blood flow to organs is reduced, flow to muscles is increased

  8. Neurotransmitters and Receptors Acetylcholine (ACh) and norepinephrine (NE) are the two major neurotransmitters of the ANS ACh is released by all preganglionic axons and all parasympathetic postganglionic axons Cholinergic fibers – ACh-releasing fibers Adrenergic fibers – sympathetic postganglionic axons that release NE Neurotransmitter effects can be excitatory or inhibitory depending upon the receptor type

  9. Parasympathetic nervous system SLUDGE Salivation, Lacrimation, Urination, Digestion, gastrointestinal cramps, emesis Most active in non-stressful situations Concerned with keeping body energy use low

  10. Sympathetic nervous system The sympathetic division is the “fight-or-flight” system Involves E activities – exercise, excitement, emergency, and embarrassment Non-essential activities are dampened (GI/urinary) Promotes adjustments during exercise – blood flow to organs is reduced, flow to muscles is increased

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