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CNRN Questions and Answers Updated 2026

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CNRN Questions and Answers Updated 2026

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CNRN Questions and Answers
Updated 2026
NeurotransmittersM-
MAnswerMChemicalMsubstancesMfoundMinMtheMCNSMthatMexcite,Minhibit,MorMmodifyMthe
MresponseMofManotherMcerebralMcell(s)



DendritesM-MAnswerMDirectMimpulsesMtowardMtheMcellMbody



AxonM-MAnswerMCarriesMimpulsesMawayMfromMtheMcellMbody



Amines:MAcetylcholineM(ACh)M-MAnswerMUsuallyMexcitatory

InhibitoryMeffectMonMsomeMofMparasympatheticMnervousMsystem

ChiefMtransmitterMofMtheMPNS



Amines:MSerotoninM(5-HT)M-
MAnswerMControlsMbodyMheat,Mhunger,MbehaviorMandMsleep.M

InhibitorMofMpainMpathwayMcord;MhelpsMtoMcontrolMmoodMandMsleep



Cathecholamines:MDopamineM(DA)M-
MAnswerMAffectsMcontrolMofMbehaviorMandMfineMmovement

UsuallyMinhibitory



Cathecholamines:MNorepinephrineM(NE)M-MAnswerMChiefMtransmitterMofMSNS

UsuallyMexcitatoryMcanMbeMinhibitory



A.A.:MGamma-aminobutyricMacidM(GABA)M-MAnswerMExcitatory



A.A.:MGlutamicMacidM-MAnswerMExcitatory



GlycineM-MAnswerMInhibitory



SubstanceMPM-MAnswerMExcitatory

, Polypeptides:MEnkephalinM-
MAnswerMExcitatoryMtoMsystemsMthatMinhibitMpain;MbindsMtoMtheMsameMreceptorsMinM
theMCNSMthatMbindMopiatesMdrugs



Polypeptides:MEndorphinM-
MAnswerMBindsMtoMopiateMreceptorsMinMtheMbrainMandMpituitaryMgland;MexcitatoryMto
MsystemsMthatMinhibitMpain



EpiduralMspaceM-MAnswerMLocatedMbetweenMtheMskullM&MduraMmater



SubduralMspaceM-
MAnswerMLocatedMbetweenMtheMinnerMduraMmaterM&MtheMarachnoidMlayer



SubarachnoidMspaceM-MAnswerMLocatedMbetweenMtheMarachnoidM&MpiaMmaterMlayers.

ContainsMCSF



WhatMisMtheMspecificMgravityMofMCSF?M-MAnswerM1.007



AmountMofMCSFMinMadults?M-MAnswerM125-150ml



ChoroidMplexusM-
MAnswerMAMcollectionMofMbloodMvesselsMcoveredMbyMaMthinMcoatingMofMependymalMc
ells



NameMtheM3MproducesMofMCSFMfluidM-
MAnswerMChoroidMplexus,MependymalMcellsMandMbloodMvesselsMofMtheMbrain



WhatMareaMdoesMtheMMCAMsupply?M-
MAnswerMEntireMlateralMsurfacesMofMtheMhemispheresMexceptMforMtheMoccipitalMpoleM
&MtheMinferolateralMsurfaceMofMtheMhemisphere



WhatMareMdoesMtheMACAMsupply?M-
MAnswerMMedialMsurfaceMofMfrontalMandMparietalMlobes

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