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ch 13 spinal cord and spinal nerves
ch 13 spinal cord and spinal nerves
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37 Terms
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1
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How many pairs of spinal nerves?
31
2
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what are sensory nerves called?
afferents
3
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what are motor nerves called?
efferents
4
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cone-shaped end of spinal cord
conus medullaris
5
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thread-like extension of pia mater, stabilizes spinal cord in canal
filum terminale
6
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dorsal & ventral roots of lowest spinal nerves
caudae equinae
7
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area of cord from which each pair of spinal nerves arises
spinal segment
8
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shaped like a letter H or a butterfly; contains neuron cell bodies, unmyelinated axons & dendrites
gray matter
9
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prevents injury from over stretching because muscle contracts when it is stretched
stretch reflex (patellar reflex)
10
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controls muscle tension by causing muscle relaxation that prevents tendon damage
tendon reflex
11
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outermost layer/toughest
dura mater
12
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pia mater below the medullary cone
terminal filium
13
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innermost layer, closely over lays spinal cord, delicate collagen fibers, vascular
pia mater
14
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subarachnoid space below the medullary cone
lumbar cistern
15
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loose mesh of collagen and elastic fibers
subarchnoid space
16
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middle layer, simple squamous epithelium/adheres to inside of dura mater
arachnoid mater
17
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adipose tissue, blood vessels, loose connective tissue
spidural space
18
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Gray matter is the site of synaptic connections between neurons and neuronal integration
true
19
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What connects the left and right sides of gray matter?
gray commissure
20
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conducts signals from peripher to CNS
dorsal root
21
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conducts signals from CNS to periphery
ventral root
22
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dorsal root and ventral root join to exit
vertebral foramina
23
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bundle of nerves on dorsal root
dorsal root ganglion
24
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supplies muscles and joints to the spine and skin of back
posterior (dorsal) ramus
25
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supplies meninges and vertebrae
meningeal branch
26
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how far does the spinal cord run?
foramen magnum - L1
27
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The spinal cord passes through the _________
foramen magnum
28
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The conus medullaris is the tapering point at the end of the spinal cord. It is located at approximately _________
L1/L2
29
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The tail end of the spinal cord is not “hanging loose.” It is actually anchored via the __________, which connects to the coccyx bone
filum terminale
30
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How many plexus groups branch off the spinal cord?
4
31
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Which of the following spinal cord regions are NOT involved with a plexus formation
thoracic
32
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The cauda equina are nerves that branch off the spinal cord in which of the following areas?
inferior end
33
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What is the name of the structures that hold the spinal cord in position within the vertebral foramen?
denticulate ligaments
34
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Which of the following transmits information from the spinal cord to the extremities of the body?
ventral roots
35
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Fasciculi are bundles of nerve tracts associated with _________
the white matter of the spinal cord
36
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Which of the following will merge together (after branching off the spinal cord) to form a spinal nerve?
ventral and dorsal roots
37
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The plexus groups that are formed from the branches off the spinal cord are formed from the merging of ________
one ventral ramus with another ventral ramus
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