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The Peripheral NervousSystem: Efferent DivisionChapter 7
EFFERENT NEURONSSend signals from (Exit) the CNS out toeffector organs (muscles & glands)Two branches of the Efferent DivisionThe Autonomic BranchThe Somatic Branch
THE AUTONOMIC NSIts major functions deal with Homeostasis.The autonomic nervous system (ANS)innervates cardiac and smooth muscle,most exocrine glands and some endocrineglands.The ANS releases only two differentneurotransmitters on the structures itcontrols: ACETYLCHOLINE andNOREPHRINE.There are two sub-divisions of the ANS
The Divisions of the ANS are theSympathetic and ParasympatheticNervous Systems.Sympathetic nerve fibers originatefrom the thoracic and lumbar levels ofthe spinal cord.Its preganglionic fibers are short.Itspostganglionic fibers are long,terminating at effectors.They release NOREPHRINE
Para-Sympathetic DivisionParasympathetic nerve fibersoriginate from the cranial and sacrallevels of the CNS.Its preganglionic fibers are long.Itspostganglionic fibers are short,terminating at effectors.They release ACETYLCHOLINE
NerveConnections between theCNS and the ANS effector organsThere is a fast, two neuron relay system.One neuron originates in the CNS(preganglionic) and synapses outside the CNSwith the postganglionic neuron.The second neuron (postganglionic) goesdirectly to the effector organ.This provides for very fast (rapid)communication between the CNS and effectors.
CentralnervoussystemPreganglionic fiberPreganglionicNeurotransmitterAcetylcholinePosganglionic fiberVaricosityPosganglionicNeurotransmitterSympathetic = NorephrineParaSympathetic = ACHEffector organAutonomic ganglion
The Neuro-Transmitters ofthe ANSParasympathetic postganglionic fibersrelease ACh.They are called: cholinergic fibers.Sympathetic postganglionic fibersrelease norepinephrine (noradrenalin).

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Term
Spring
Professor
GIL
Tags
motor end plate, sympathetic nerve fibers, Posganglionic Neurotransmitter Sympathetic

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