Spinal Cord And Nerves

Spinal Cord And Nerves Anatomy 
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divisions of the nervous system
 
central nervous system (CNS)peripheral nervous system (PNS)
central nervous system
 
brain and spinal cord
peripheral nervous system
 
all nerves other than brain and spinal cord
nucleus
 
find deffiniiton
ganglion
 
find deffintition
three types of cells
 
sensory neuronmotor neuroninter neuron
sensory neuron is found...
 
in dorsal roots
motor neurons are found...
 
in ventral roots
inter neurons are found...
 
in posterior horns
motor neurons go...
 
out of PNS to the glands
afferent
 
going in
efferent
 
going out
somatic sensory
 
coming from body
visceral sensory
 
senses from organs
somatic motor
 
movement of body
visceral motor
 
movement of organs
spinal cord is protected by
 
bonemeningescerebrospinal fluidfat
spinal cord is made up of
 
white and gray matter
spinal nerves
 
31 pairs
branch off from intervertebral foramen
main functions of spinal cord
 
main section for reflexes
involved in sensory and motor
meninges
 
(membrane) CT that wraps around spinal cord and brain
three layers of meninges
 
duraarachnoidpia
dura
 
most superficial layer-wraps around beginnings of spinal nerves-merges with epineurium of spinal roots and nerves
epidural
 
outside space of duranot in brain
subdural
 
between dura and arachnoid
arachnoids
 
looks like a spider web
middle layer
subarachnoid
 
between arachnoid and pialarger blood vesselsruns to level S2contains cerebrospinal fluid
pia
 
deepest layerhighly vascular
Gray matter
 
-H shaped-doesnt reach the end of the anterior part-has a canal in the center-gray commissure runs in crossbars
posterior horns
 
cell bodies of sensorycell bodies of interneurondorsal roots
anterior horns
 
-cell bodies of motor-sends info out of spinal cord to muscles and glands-ventral roots
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