Author Question: Which of these statements about the peripheral nervous system is correct? a. The CNs enter the ... (Read 61 times)

swpotter12 · **on:** Jun 25, 2018

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.

Question 2

A 30-year-old woman tells the nurse that she has been very unsteady and has had difficulty in maintaining her balance. Which area of the brain that is related to these findings would concern the nurse?

a. Thalamus
b. Brainstem
c. Cerebellum
d. Extrapyramidal tract

Ksanderson1296 · **Reply #1 on:** Jun 25, 2018

Answer to Question 1

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.

Answer to Question 2

ANS: C
The cerebellar system coordinates movement, maintains equilibrium, and helps maintain posture. The thalamus is the primary relay station where sensory pathways of the spinal cord, cerebellum, and brainstem form synapses on their way to the cerebral cortex. The brainstem consists of the midbrain, pons, and medulla and has various functions, especially concerning autonomic centers. The extrapyramidal tract maintains muscle tone for gross automatic movements, such as walking.