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
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