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chapter 8-1 (CNS=4 proide bulk and spinal cord tissue (oligondenocyte,…
chapter 8-1
CNS=4 proide bulk and spinal cord tissue
oligondenocyte
Astrocyes
microglia
ependymal cells
structural classifiction
mulipolor neurons
Bipolar Navrons
unipolar neurons
the organs of the nervous system are divded into tow major groups
centeal nervous system brain and spinal cord
Peripheal nevous system nerver the exend
extensions from bell body two types
Dendrites
Axon
A bundle of myelinated nerve fibers white matter
PNS = Nerve
CNS= Thact column
This is in contrast to CNS gray matter a bundle of cell bodies (or ummyelinated never fibers
PNS = Ganglin
CNS=hucleus
General functions of nevrous system
sensory inpot functions
A sensory impulse is carried on a
sensory nevous integatve function
integration occurs in
intereurons
A motor impulse begins
motor functions
A motor impulus is carried on a
Motor neuron
central portion of neuron
Cell body
in brain ans spinal cord
Axons in cns
Neuroglial cells
accessory cells of nervous system from supporting network for nerons never glue.
PNS= schuwann cell produces myelin
and sateitte cells nourish neurrons
Functional of nevrons
sensory nevrous
PNS
Afferent nevrous
Location of receptos skin and sense organs
sematic recptors
Propriocpors position and movemment
visscreal receptors
interneurons association
association
chapter 8.3
k
high inside
NA
high outside
CL
high outside
A resting neurons cell membrane is said to be
Polarized
DEF
Potential Difference = the difference in electrical charge between 2 points
less negative
depolarriztion
when the resting membrane potentil RMP of neuron is depolarized to
55mv threshold potenntial
ressults in rapid depolariztion
+30mv
DEF
Nerve impulse
refractory period
the period following a NI when a thershold
All or nothing response
if a nerve cell responds at all it reponds completely
synapse
the junctions between tow neurons where a nerve impules is transmitted
note that the two neurous do not touch there is gap between them
synaptic cleft
most typical NT is
Acetylchline
Resting nerve cells
the RMP of a nerve cell is meaured to be 70 -mv
rapid opening of NA+
chapter 8.5
the membranes around the brain and spinal cord are called meninges three distnct layers
Dura mater
Arachoid mater
Pia
the space between the dura mater and the bone is called the
ventricles
gray matter
or butterfly= bundles of interneuron cell bodies
white matter
myelinated interneuron axons
contains 31 segment and therefore gives ride to 31 pairs of spinal nervers
note caude equina
in general ascending are located in the
in general descending tracts are located in the anteroir
chapter 8
synaptic knobs occur at the ends of
axons
neurotransmitters are released from the
synaptic terminals knobe