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Challenge Yourself
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1
The tapered inferior end of the spinal cord is called the
A)conus medullaris.
B)filum terminale.
C)cauda equina.
D)posterior root.
2
The anterior root of a spinal nerve contains
A)axons of both motor and sensory neurons.
B)axons of sensory neurons only.
C)interneurons.
D)axons of motor neurons only.
3
Identify the meningeal layer immediately deep to the subdural space.
A)pia mater
B)arachnoid
C)epidural space
D)dura mater
4
Axons cross from one side of the spinal cord to the other through a gray matter region called the
A)lateral horn.
B)posterior horn.
C)gray commissure.
D)white commissure.
5
The radial nerve originates from the ________ plexus.
A)cervical
B)lumbar
C)sacral
D)brachial
6
Which structure provides motor innervation to the deep back muscles and receives sensory information from the skin of the back?
A)anterior ramus
B)anterior root
C)posterior ramus
D)posterior root
7
Lower limbs are supplied by neurons from the______ of the spinal cord.
A)lumbar enlargement
B)thoracic region
C)cervical enlargement
D)all of the above
8
The subarachnoid space contains ________, and the epidural space contains ________.
A)CSF; fat, connective tissue, and blood vessels
B)fat, connective tissue, and blood vessels; blood
C)CSF; pia mater
D)fat, connective tissue, and blood vessels; CSF
9
The white matter of the spinal cord is composed primarily of
A)unmyelinated axons.
B)neurolemmocytes and satellite cells.
C)myelinated axons.
D)cell bodies of neurons.
10
Which statement is true about intercostal nerves?
A)They are formed from the posterior rami of spinal nerves.
B)They form a thoracic plexus of nerves.
C)They originate from the thoracic region of the spinal cord.
D)They innervate the deep back muscles of the thoracic region.





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