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Samenvatting Zenuwstelsel

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ZENUWSTELSEL
INHOUDSOPGAVE

inleiding ................................................................................................................................................. 4
homeostase ........................................................................................................................................ 4
indeling .................................................................................................................................................. 5
anatomische indeling........................................................................................................................... 5
fysiologische indeling........................................................................................................................... 6
afferente & efferente zenuwen ............................................................................................................. 6
afferente zenuwvezels ...................................................................................................................... 6
efferente zenuwvezels ...................................................................................................................... 6
anatomie vh zenuwstelsel ..................................................................................................................... 8
cellen vh zenuwstelsel ......................................................................................................................... 8
bouw neuron ....................................................................................................................................... 9
cellichaam ....................................................................................................................................... 9
axon ................................................................................................................................................. 9
dendrieten ..................................................................................................................................... 10
myelineschede............................................................................................................................... 10
neuronen ........................................................................................................................................... 12
neuron ........................................................................................................................................... 14
functie neuron ................................................................................................................................... 16
receptie ......................................................................................................................................... 16
integratie........................................................................................................................................ 17
conductie....................................................................................................................................... 17
chemische transmissie .................................................................................................................. 17
gliacellen ........................................................................................................................................... 19
bouw vh zenuwstelsel ......................................................................................................................... 19
grijze en witte stof .............................................................................................................................. 19
structurele organisatie PZS ................................................................................................................ 19
structurele organisatie CZS ................................................................................................................ 20
bloed – hersen – barriere ................................................................................................................ 20
cerebrum ............................................................................................................................................. 22
bouw ................................................................................................................................................. 22
lobi ................................................................................................................................................ 23
sulci ............................................................................................................................................... 23
gyri ................................................................................................................................................. 23


1

, grijze stof ....................................................................................................................................... 24
witte stof ........................................................................................................................................ 24
fysiologie/ functies............................................................................................................................. 25
lobus frontalis.................................................................................................................................... 26
primaire motorische cortex ............................................................................................................ 26
prefrontale cortex........................................................................................................................... 27
lobus parietalis .................................................................................................................................. 28
primair sensibele cortex ................................................................................................................. 28
lobus temporalis................................................................................................................................ 29
primaire auditieve cortex ................................................................................................................ 29
lobus occiputalis ............................................................................................................................... 29
primair visuele cortex ..................................................................................................................... 29
lateralisatie ....................................................................................................................................... 29
netwerken en circuits ......................................................................................................................... 30
bloedvoorziening ............................................................................................................................... 30
arterien .......................................................................................................................................... 30
venen ............................................................................................................................................. 31
diencephalon ....................................................................................................................................... 33
ligging ................................................................................................................................................ 33
thalamus ........................................................................................................................................... 33
functie ........................................................................................................................................... 33
hypothalamus ................................................................................................................................... 34
functie ........................................................................................................................................... 34
epithalamus ...................................................................................................................................... 35
limbisch systeem ............................................................................................................................... 35
functie ........................................................................................................................................... 36
truncus cerebri .................................................................................................................................... 36
cerrebullum ......................................................................................................................................... 38
functies ............................................................................................................................................. 39
meningen ............................................................................................................................................. 39
functie ........................................................................................................................................... 40
dura mater thv hersenen ................................................................................................................ 40
dura mater thv rugggenmerg ........................................................................................................... 41
arachnoïdea mater ............................................................................................................................ 41
pia mater ........................................................................................................................................... 41
meningen hersenen en ruggenmerg.................................................................................................... 42
ventrikels ............................................................................................................................................. 42

2

, liqour systeem ................................................................................................................................... 43
verloop........................................................................................................................................... 43
functie ........................................................................................................................................... 43
aanmaak ........................................................................................................................................ 44
terugresorptie ................................................................................................................................ 44
medulla spinalis .................................................................................................................................. 47
functie ............................................................................................................................................... 47
bouw ................................................................................................................................................. 48
witte stof ........................................................................................................................................ 49
grijze stof ....................................................................................................................................... 49
spinale zenuw ................................................................................................................................ 51
reflexen ............................................................................................................................................. 51
reflexboog ...................................................................................................................................... 51
enkelvoudige reflex ........................................................................................................................ 52
complexe reflex .............................................................................................................................. 52
functie ........................................................................................................................................... 52
perifeer ZS ............................................................................................................................................ 55
spinale zenuwen ................................................................................................................................ 55
perifere zenuwen ............................................................................................................................... 58
motorische zenuwen ...................................................................................................................... 58
(somato)sensibele zenuwen ........................................................................................................... 58
craniale zenuwen............................................................................................................................... 58
N. olfactorius ................................................................................................................................. 59
N. opticus ...................................................................................................................................... 59
N. vagus ......................................................................................................................................... 60
autonoom zenuwstelsel ...................................................................................................................... 60
afferente sensibele banen .............................................................................................................. 62
efferente motorische banen ........................................................................................................... 62
orthosympatisch ZS ........................................................................................................................... 62
parasympatisch ZS ............................................................................................................................ 62




3

, INLEIDING


Verantwoordelijk voor coördinatie v alle lichaamsfuncties

Ontvangt – verwerkt – verzend signalen door hele lichaam

Elektrische en chemische signalen



Hierdoor organismen reageren op interne en externe prikkels

o Aanpassing v beweging en gedrag via spieren en klieren
o Regelen v automatische lichaamsfuncties zoals BD en AH (d.i.
homeostase)
o Betrokken bij cognitieve en emotie:
▪ Denken, geheugen, emoties en bewustzijn




WAT IS HET ZENUWSTELSEL?
Orgaan dat reageert veranderingen

Vangt prikkels op uit lichaam zelf en buitenwereld en verwerkt deze

Signalen uitzenden die lichaam laten functioneren en
bewegen Het ZS zorgt voor snelle
afstemming op de omgeving


In CZS nieuwe signalen gegenereerd – worden doorgegeven aan perifeer ZS

➢ Resulteren in bepaalde actie (spiercontractie of klieractiviteit)




HOMEOSTASE

ZS samen met endocrien stelsel belangrijke rol bij handhaven v homeostase

Coördineert en stuurt vitale functies aan

-> Snelle communicatie tss alle delen v lichaam

Levert onmiddellijke respons
-> endocrien stelsel langzamer reageert, meer duurzame reactie




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