Chapt 14 The Autonomic Nervous System.ppt - Nervous System...

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Nervous System IVThe Autonomic Nervous SystemAnatomy and Physiology I1
General Lecture OutlineAutonomic Nervous System description andcharacteristicsEfferent pathways and their neurotransmittersVisceral ReflexesReferred PainReceptors for NeurotransmittersEffects of DrugsAutonomic divisions and characteristicsHypothalamic control2
Nervous SystemFunctions1. Sensory input2. Integration of information3. Motor output4. Maintaining Homeostasis5. Establishing and maintaining mental activity3
Autonomic Nervous System(ANS)TheANS consists of motor neurons that:
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Autonomic Nervous SystemControlled unconciouslyComposed of theSympathetic andSympathetic andParasympathetic branchesParasympathetic branchesSympathetic System– prepares the individualfor physical activity (Fight or Flight)Parasympathetic System– activates functionsof the body at rest (digestion)5
Autonomic Nervous System(ANS)Other namesInvoluntary nervous system: We cannot contolGeneral visceral motor system6
Central nervous system (CNS)Peripheral nervous system (PNS)Motor (efferent) divisionSensory (afferent)divisionSomatic nervoussystemSympatheticdivisionParasympatheticdivisionFigure 14.17
Overview of thenervous system8
Divisions of the Nervous SystemCentral nervous systemA. BrainB. Spinal cordPeripheral nervous system:all nervous tissue outside the CNSA. SensoryB. Motora. Somaticb. Autonomic-Sympathetic-ParasympatheticBrainSpinalcordCranialnervesSpinalnerves9
Somatic and AutonomicNervous SystemsThe two systems differ inEffectors(Somatic-Skeletal) (Auto-Cardiac/Smooth)Efferent pathways (and theirneurotransmitters)Target organ responses to neurotransmittersAcetocholine for SomaticNorepinephrine for Autonomin or acetocholine10
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Divisions of the Nervous SystemCentral nervous systemA. BrainB. Spinal cordPeripheral nervous system:all nervous tissue outside the CNSA. SensoryB. Motora. Somaticb. Autonomic-Sympathetic-ParasympatheticBrainSpinalcordCranialnervesSpinalnerves12
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Neurotransmitter Effects14
Skeletal musclePeripheral nervous systemEffect++EffectororgansAChAChSmooth muscle(e.g., in gut),glands, cardiacmuscleGanglionAdrenal medullaBlood vesselAChAChAChNEEpinephrine andnorepinephrineAcetylcholine (ACh)Norepinephrine (NE)GanglionHeavily myelinated axonLightly myelinatedpreganglionic axonLightly myelinatedpreganglionic axonsNeuro-transmitterat effectorUnmyelinatedpostganglionicaxonUnmyelinatedpostganglionic axonStimulatoryStimulatoryor inhibitory,dependingon neuro-transmitterandreceptorson effectororgansSingle neuron from CNS to effector organsTwo-neuron chain from CNS to effector organsSOMATICNERVOUSSYSTEMAUTONOMICNERVOUS SYSTEMPARASYMPATHETICSYMPATHETICFigure 14.215
Divisions of the ANS16
Divisions of the Nervous System

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Term
Spring
Professor
AlexaSawa,Ph.D

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