Which of these statements about the peripheral nervous system is correct?
a. The CNs enter the brain through the spinal cord.
b. Efferent fibers carry sensory input to the central nervous system through the spinal cord.
c. The peripheral nerves are inside the central nervous system and carry impulses through their motor fibers.
d. The peripheral nerves carry input to the central nervous system by afferent fibers and away from the central nervous system by efferent fibers.
ANS: D
A nerve is a bundle of fibers outside of the central nervous system. The peripheral nerves carry input to the central nervous system by their sensory afferent fibers and deliver output from the central nervous system by their efferent fibers. The other responses are not related to the peripheral nervous system.
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