Block 5 Flashcards
__ fibers convey information towards the CNS
sensory
__ fibers convey information from the CNS
motor
Sensory and motor function are __ in the nervous system
separated
afferent fibers are __
sensory
efferent fibers are __
motor
axes of orientation; spatial reasoning to determine structure position; used in both brain and body
system orientation
towards the tip of the head
rostral
towards the tip of the tail
caudal
upper surface of the body
dorsal
bottom surface of the body
ventral
close to the midline
medial
farther from the midline
lateral
close
proximal
far
distal
in humans, __ is used in place of rostral
anterior
in humans, __ is used in place of caudal
posterior
How many pairs of nerves branch off from the spinal cord?
31
each nerve is split into __ and __ roots
dorsal, ventral
dorsal roots are ___
sensory
ventral roots are __
motor
DRG: cell bodies for all __ neurons entering the spinal cord
sensory
DRG cell bodies lie ___ the CNS and __ the PNS
outside, inside
each sensory and motor spinal nerve receives information from and projects information to specific body regions called ___
dermatomes
long nerves from the spinal cord that dangle down and branch off to the legs
cauda equina
epidural anesthetic is injected between __
L2 and L3
bundle of myelinated axons running up and down the spinal cord; opaque to light
white matter
unmyelinated structures in the spinal cord; translucent to light
gray matter
white matter in the CNS is called __, __, or __
tract, fasciculus, pathway
white matter in the spinal cord consists of __ and __
sensory afferent fibers and motor efferent fibers
gray matter is a collection of __ in the spinal cord
cell bodies
occupies the central region of the spinal cord, therefore is called __; 4 lobed structure home to spinal sensory and motor function
Central Gray Region
first cell in the sensory system is the ___
first order neuron
the soma of all first order neurons lie __ the CNS __ the PNS in the DRG
outside, inside
all first order neurons synapse onto a ___ in the CNS for somatosensory systems
second order neuron
nerve fibers often ___ to innervate structures on the other side of the body
cross midline
the left brain controls the __ side of the body due to __
right; decussation