, Ch5 : Nervous Communication -CNS-central NS
↳ peripheral nervous
system
Neurones
Typical Motor neur one structure Opendrites (dendron or dendrite)
They
ransmit electric impulses towards -
the cell
body .
-
They
-
have ribosomes
-
Mostly, unmyelinated.
②cellbody ③ Axon .
many mitochondria it's long
a
cytoplasmic projection
-
-
Nisslbodies
it transmits
:
-
electric
-
-
impulses y
special type of rER surrounded by
hom the cell
unmyelinated parts
rosettes of free ribosomes . body
of axo .
-
it hasNo ribosomes.
⑦ Nodes of Ranvier
mostly myelinated
--
↑ speed of conduction -
,
unmyelinated parts of axon
-
muscle
Sheath formed by
- -
⑤ by m
- -
TS/CS of axon covered
-
- motor end plate
/
neuromuscular Schwann Cells .
junction nucleus
axon
away insulation
by
v.S DenNites selectic
Axons
cytoplasm
myelin sheath sected
Axons transmit electric impolses away from
-
Schwann cell
well
body ,
while dendrites transmit electric
impulses towards
the cell body
-
Axon has no ribosomes , while dendrites have ribosomes
-
Axon is mostly myelinated, dendrites are mostly unmyelinated.
jeceptor
⑭
receptio
ing
s
central -
clenhon)
Reflex
-
Arc
/greymatter-white matter
long
-smostly
-
mmm .
- -
- - -
-
- -
-
greymatter White matter
fat-whitein Cr -
myelin is fat >
- white
.
N .
B
.
neurone-nervecell
nerve fibre = axon of a neurone
nerve-bundle of nerve fibres (axons
, Reo-Immediate
involuntary protective response that occurs attelet the spinal cord or the bane
painful
-
stimulus
S
Types of Reflex Actions
# According to Synapses (no -
-- to of reflex
(1) (203)
According cente
-
monosynaptic polysynaptic Spinal Reflexcranialreflex
.
(most common) (below the mandible of
-
Sensory neurone is centre =
unconscious area
connected to
Censy nemone is
spinal cord one brain
popillary reflex.
-
directly connected to centre =
ex
1 or more neurones which
relay ex knee reflex.
motor neuroe are connected to motrnewron
membrane Potential
Resting more let channels Nat channels
Nat
comembraneT permeable U+
to >
Def Difference bin inside f outside neurone utchannel
charges
the a
D-4 positive charges outside than inside
ereoutside -
Natchannel
Nata RMP -TOMV
↑159 inside outside
.
=
-
=
reacted
differ main intracellular
um
cate
s is
diff = c ↑ It
equilibrium
intracellular is+
gractive transport unon-quedcawele
a
·
main
main extracellular is Nat againstconc
of let channels ③ voltage gated channel,inactive/closed atrest)
E non-gatedChannesaarrier)
·
no of Nat channels = no
Def difference bth inside and outside the well AT REST.
: The the
charges
outside/Polarisea
> in
-
neurones RMP = -Lo MV (inside-outside) = more the
How is this reached ?
of rest
charges at
-
The membrane of a neurone is more permeable toltions as it has
Ut channels than Nat Channels
a
larger number of e facilitated
.
- so more let exits the cell than Nat entering [Diffusion down conc gradient]
-
The Nathtpump ACTIVELY more 3 Nat outside and adds only 24 + inside Cunfair
[Active transport against conc
gradient using energy]
This leads than inside .
to
charges outside the neurone
-
more the
[-ve membrane potential]
↳ peripheral nervous
system
Neurones
Typical Motor neur one structure Opendrites (dendron or dendrite)
They
ransmit electric impulses towards -
the cell
body .
-
They
-
have ribosomes
-
Mostly, unmyelinated.
②cellbody ③ Axon .
many mitochondria it's long
a
cytoplasmic projection
-
-
Nisslbodies
it transmits
:
-
electric
-
-
impulses y
special type of rER surrounded by
hom the cell
unmyelinated parts
rosettes of free ribosomes . body
of axo .
-
it hasNo ribosomes.
⑦ Nodes of Ranvier
mostly myelinated
--
↑ speed of conduction -
,
unmyelinated parts of axon
-
muscle
Sheath formed by
- -
⑤ by m
- -
TS/CS of axon covered
-
- motor end plate
/
neuromuscular Schwann Cells .
junction nucleus
axon
away insulation
by
v.S DenNites selectic
Axons
cytoplasm
myelin sheath sected
Axons transmit electric impolses away from
-
Schwann cell
well
body ,
while dendrites transmit electric
impulses towards
the cell body
-
Axon has no ribosomes , while dendrites have ribosomes
-
Axon is mostly myelinated, dendrites are mostly unmyelinated.
jeceptor
⑭
receptio
ing
s
central -
clenhon)
Reflex
-
Arc
/greymatter-white matter
long
-smostly
-
mmm .
- -
- - -
-
- -
-
greymatter White matter
fat-whitein Cr -
myelin is fat >
- white
.
N .
B
.
neurone-nervecell
nerve fibre = axon of a neurone
nerve-bundle of nerve fibres (axons
, Reo-Immediate
involuntary protective response that occurs attelet the spinal cord or the bane
painful
-
stimulus
S
Types of Reflex Actions
# According to Synapses (no -
-- to of reflex
(1) (203)
According cente
-
monosynaptic polysynaptic Spinal Reflexcranialreflex
.
(most common) (below the mandible of
-
Sensory neurone is centre =
unconscious area
connected to
Censy nemone is
spinal cord one brain
popillary reflex.
-
directly connected to centre =
ex
1 or more neurones which
relay ex knee reflex.
motor neuroe are connected to motrnewron
membrane Potential
Resting more let channels Nat channels
Nat
comembraneT permeable U+
to >
Def Difference bin inside f outside neurone utchannel
charges
the a
D-4 positive charges outside than inside
ereoutside -
Natchannel
Nata RMP -TOMV
↑159 inside outside
.
=
-
=
reacted
differ main intracellular
um
cate
s is
diff = c ↑ It
equilibrium
intracellular is+
gractive transport unon-quedcawele
a
·
main
main extracellular is Nat againstconc
of let channels ③ voltage gated channel,inactive/closed atrest)
E non-gatedChannesaarrier)
·
no of Nat channels = no
Def difference bth inside and outside the well AT REST.
: The the
charges
outside/Polarisea
> in
-
neurones RMP = -Lo MV (inside-outside) = more the
How is this reached ?
of rest
charges at
-
The membrane of a neurone is more permeable toltions as it has
Ut channels than Nat Channels
a
larger number of e facilitated
.
- so more let exits the cell than Nat entering [Diffusion down conc gradient]
-
The Nathtpump ACTIVELY more 3 Nat outside and adds only 24 + inside Cunfair
[Active transport against conc
gradient using energy]
This leads than inside .
to
charges outside the neurone
-
more the
[-ve membrane potential]
