Preganglionaire neuronen sturen axonen
(preganglionaire vezels) naar autonome
ganglia
In autonome ganglia zijn axonen van
preganglionaire neuronen verbonden met
ganglionaire neuronen via synapsen
Postganglionaire vezels verlaten ganglia en
innerveren hartspier, gladde spieren,
klieren en vetcellen
SYMPATHISCH ZENUWSTELSEL
Synoniem: Fight-or-flight-systeem
Functies:
, - Stimuleert stofwisseling in de weefsels
- Verhoogt waakzaamheid
- Bereidt het individu voor op plotselinge, intensieve, lichamelijke activiteit (stress)
dit deel wordt geactiveerd: hartslag stijgt, luchtwegen verhogen, pupillen verwijden
- Doorbloeding van huid en lichaamswand daalt
- Doorbloeding naar skeletspieren stijgt
Onderdelen
- Preganglionaire neuronen
o Komen binnen tussen T1 en L2 van hat ruggenmerg
o Liggen aan de laterale grijze hoorns
o Korte axonen komen binnen aan de ventrale wortels ter hoogt van deze segmenten
- Neuronen in de ganglia
o Gepaarde ganglia van grensstrengen
Lopen aan weerszijde van wervelkolom
Bevatten neuronen
Sturen effectoren in lichaamswand en borstholte aan
o Ongepaarde prevertebrale ganglia
Lopen ventraal ten opzichte van de wervelkolom
Bevatten ganglionaire neuronen
Weefsels en organen innerveren van buik en bekkenholte
- Bijniermerg
o Middelste gedeelte van elke nier
o Gemodificeerd ganglion
o Neuronen hebben korte awonen
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