Ch.14-The Autonomic Nervous System_revised FA2017.pptx - 14...

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14The Autonomic Nervous SystemChapter
Autonomic nervous system (ANS)Sends motor commands to visceraInvoluntaryIn motor division of PNSRegulates day-to-day processesHeart rate, blood pressure, body temperature, etc.Adjustsactivity of organs to body’s changing needs (14.7)Maintain or move away from homeostasisViscera function even without autonomic innervationIntroduction to the Autonomic Nervous System
PreganglionicneuronSmoothmuscleGlandsCardiacmuscleAdipocytesAutonomicgangliaGanglionicneuronPreganglionicneuronBrainstemSpinalcordBrainVisceral EffectorsGanglionicneuronAUTONOMIC NERVOUS SYSTEMRemember … twosubdivisions of motor division of PNSSomatic nervous system (SNS)Sends motor commands to skeletal musclesImpulse travels from CNS through oneneuron to effectorsAutonomic nervous system (ANS)Sends motor commands to viscera Impulse travels from CNS through twoneurons to effectorsPreganglionic neuronoFirst cell in autonomic pathwayoCell body in brainstem or spinal cordGanglionic (postganglionic) neuronoSecond cell in autonomic pathwayoCarries command to effectors (target organs)Autonomic gangliaoWhere preganglionic, ganglionic neurons synapseSomatic vs. Autonomic Motor Divisions of PNS (14.1) SkeletalmuscleMotorneuronsSkeletalmuscleSpinal cordBrainSOMATIC NERVOUS SYSTEMFigure 14.11-2
Two divisions innervate same organs but have opposing effectsDivisions of the Autonomic Nervous System (14.2) Sympathetic (thoracolumbar) division:Temporarily takes body away from homeostasis to accomplish taskExertion, stress, emergency (“fight or flight”)Preganglionic neurons:Originate from lateral horns of thoracic & lumbar spinal cordShortGangliaclose to spinal cordGanglionic neuronslongFigure 14.21
Parasympathetic (craniosacral) division:Maintains homeostasis“Resting & digesting”Preganglionic neurons:Originate from brainstem & sacral spinal cordLongGanglia

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Term
Spring
Professor
Jennifer Gehring
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