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dorsal root
sensory
posterior
ventral root
motor
anterior
dura mater
“tough mother”
strong
arachnoid mater
spidery looking
carries blood vessels
pia mater
“delicate mother”
adheres tightly to surface for spinal cord
does spine need own blood supply
yes
cauda equina
approx L3
horses tail
where do cervical nerves exit
C1-C7 exit superior to their respective vertebrae
C8 exits inferior to C7 vertebrae
cervical plexus
C1-C5
brachial plexus
C5-T1
Phrenic n
C3-C5 (innervates diaphragm)
what does axillary supply
deltoid and teres
what does musculocutaneous supply
elbow flexors
what does radial supply
shoulder, elbow, wrist, and finger exteensors
what does median and ulnar supply
flexors of wrist and hand
what should you think of with lower back pain
sciatic nerve (sacral)
afferent fibers
sensory fibers
nerves conduct impulse to CNS
(TOWARD brain)
efferent fibers
motor fibers
nerves carry impulse to glands or muscles
(AWAY from brain)
5 components of reflex
receptor
sensory (afferent) neuron
integrating center
motor (efferent) neuron
effector
R S I M E
effects of aging on nervous system
brain reduces in size and weight
cortical neurons lost, blood flow decreases, neurotransmitter production is limited, and memory processing slows
Note
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