Summary The nervous system grade 9

The nervous
system
voustissue


voustissue isspecialised toreacttostimuliandto conductimpulsestovariousorgans inthebodywhichbringabouta response tothestimulus


wetissueare allmadeupof specialisednervecellscalledneurons brain spinalcordandperipheralnerves thatbranchthroughoutthebody


ronsareeasilystimulatedandtransmitimpulsesveryrapidly Anerve is madeupofmanynervecellfibres neurons boundtogether
by t


ruous system summarised

Nervoussystem




CNS PNS




somatic vs autonomic vs




sympathetic vs parasympathetic vs


entral Nervous system Brain and spinal cord recievesinfofrombrain PNS

eriphral Nervous system sends signalsfrom CNS toother parts of bodyseparatedintosoautonomic

omatic Nervous system Controls voulentry actions


utonomic Nervous system Controls invoulentry actions


ympatheticNervous system Activates when in stressful situation Flightfight or Freeze

arasympathetic Nervous system Activates in peaceful situation

, timuli external andinternal change

eceptor detecs a stimulus


ffector part of bodythat respondes to stimulus


Cerebrum largestpartofBrain Controlls all voulentry actions
onsists of 4lobes


rontallobe reasoningplanningspeechmovementemotionsandproblemsolving


arietallobemovement orientationrecognitionperception of stimuli


capitallobevisualprocessing


mporallobeperceptionandrecognitionofauditorystimulimemoryandspeech



TSA
rinkles on thebrain increases total surface areato storemoreneurons which increases efficiency


Frontal
Parietal
Occipital

Temporal




Beak
Medulla Relays signals between the Brain and spinal cords
oblongata
Controls
involentry functions

Respiration
an Cerebellum