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Lecture 11

PS 101 Lecture 11: PS101Chapter3part4


Department
Psychology
Course Code
PS101
Professor
Don Morgenson
Lecture
11

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TheCentralNervousSystem–Thebrainandspinalcord.
Thecentralnervoussystemisprotectedbysheathscalledmeninges.
RestswithinCerebrospinalfluid,whichnourishesthebrainandprovidesaprotectivecushionfor
it.
SpinalCordConnectsthebraintotherestofthebodythroughtheperipheralnervoussystem.
Brain–Themostimportantpartofthecentralnervoussystem.
TheBrain–3sections:TheHindbrain,theMidbrain,andtheForebrain.
TheHindbrain
Thehindbrainincludesthecerebellum,themedullaandthepons.
TheMedulla
● Attachestothespinalcord.
● Inchargeofunconsciousbutvitalfunctionssuchas:bloodcirculation,breathing,
maintainingmuscletone,andregulatingreflexessuchassneezing,coughingand
salivating.
ThePons
● Ponsmeans“bridge”.
● Includesabridgeoffibresthatconnectthebrainstemwiththecerebellum.
● Containsseveralclustersofcellbodiesinvolvedwithsleepandarousal.
TheCerebellum
● Cerebellummeans“littlebrain”
● Relativelylargeandfoldedstructure.
● Criticaltocoordinationandmovement.Establishesoursenseofequilibriumandbalance.
TheMidbrain
Themidbrainisthesegmentofthebrainstemthatliesbetweenthehindbrainandforebrain.Itis
mainlyconcernedwithintegratingsensoryprocesses,suchasvisionandhearing.
Runningthroughboththehindbrainandthemidbrainisthereticularformation(anetworkof
nerves).
Itisimportanttomusclereflexes,breathingandpainperception.Bestknownforregulationof
sleepandarousal.
TheForebrain
Theforebrainisthelargestandmostcomplexregionofthebrain,encompassingavarietyof
structures,includingthethalamus,hypothalamus,limbicsystemandthecerebrum.
Thalamus–Sensoryrelaystation.
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