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5.5 $I $I : ; (The nervous system of insects)

5.5.1 BL† (Theory)

## ! '
#( "
% " , ! ' (neuron)
6/

1

/
' '
# !
! ! '
" ("
! ! ' (nerve impulses)

* H)
! 3 3 , (cell membrane) , ! ' & 6/ 5VVT (electrical
)
+/
impulses) , ! ' ,
#( " , (cell body) - "
#( "

& "! (nucleus) *
, ! ! '' #
! ! ' !) , "

/
dendrites
! ! '
!) , "
axons ! ! ' collaterals

1
%6/
# axon
1) V !O 8x;;R $I (type of neuron) #
4 % (( "
&6
1.1) sensory neuron * bipolar multipolar neurones '

6
1

)
6/
/
1

dendrites %
# " #& !+
(sense organs or receptor) ' '
!
& ) !+
5 !) ##$) ", ! ' (central nervous system)
/
1.2) motor neurons unipolar neurons '' '
! ! '
/
1
1

*
##$) ", ! '5 !)
67 6 K .6/ #!

1.3) association neurons unipolar neurons ! 2 *

! ! ' collaterals %
# axon ' ' /

! ! ' 8. - "
+/
1
1
6/

##$) ", ! ' ' 7
,
1.4) neurosecretory cells .# ##$) " ! ' (central
nervous system) '1 ' /3 U ,
"

6/
, ! ' , %
# , ! ' 6/ # " "
6/
!, (synapses)
! ! ' & 6/ H+ !, , ! '*
"

1

! &
! ! ' (neurotransmitters) # " (
.6/
! ! '
1
5 " , ! '
, +/ ! & 1
! ! '' /.# ! ,
(
! 5

)

()
! 5(
! acetylcholine, 5-hydroxytryptamine, dopamine noradrenaline
2) $I $I : ; (nervous system) , association
6/
neurons motor neurons

(" ! ! ' %
"

! ' (ganglion) ## ! ' ##'5 #
#( " 3 ##" "
/

( "
&6
/
2.1) $I central nervous system (CNS) ##!1 & 2'!0(

/

#( " ! ' (ganglia) ! ! '' % ! '

6/
(intersegmental connectives) ("'! ! ' 2 &6 ! (brain)
/

/
subesophageal ganglion %6/
# ! ''!
(thoracic ganglia) ! '