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Exam 13: The Peripheral Nervous System

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Question 1

Multiple Choice

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Which cranial nerve detects smell?

A) olfactory nerve (I)
B) trochlear nerve (IV)
C) oculomotor nerve (III)
D) optic nerve (II)

E) B) and C)
F) A) and D)

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Question 2

Multiple Choice

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In the crossed-extension reflex,if the right leg flexes,then the left leg:

A) extends.
B) abducts.
C) adducts.
D) flexes.

E) B) and C)
F) A) and B)

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Question 3

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List the cranial nerves and their corresponding Roman numerals that are generally considered sensory nerves.

Potentially damaging stimuli that result in pain are selectively detected by:

Which of the following does NOT characterize a reflex?

The visceral motor division (autonomic nervous system,or ANS)controls the body's voluntary motor functions.

A patient sustained an injury to the lower motor neurons when a board fell on his back at a construction site.The upper motor neurons are intact and undamaged.Determine the effect,if any,on motor control.

The anterior root and posterior root fuse to form a(n) :

Which division of the peripheral nervous system (PNS) detects stimuli and carries them to the central nervous system (CNS) ?

Which of the following does NOT belong to the brachial plexus?

You feel a mosquito land on your arm.This stimulus is carried to the central nervous system (CNS) by the:

People suspected of having a stroke can be asked to stick their tongues straight out.A slanted or somewhat bent tongue may be just one indicator of stroke.Determine the cranial nerve affected if the tongue is bent or slanted and identify the nerve as sensory,motor,or mixed.Describe the function of this nerve.

Motor control is initiated by lower motor neurons and transmitted to upper motor neurons by interneurons situated within the CNS.

What connects the upper motor neurons to lower motor neurons?

Receptive field maps show the regions of skin and the spinal nerve that supplies somatic sensation to them.

What is the outermost connective tissue covering of a nerve?

Outline the three-step sequence of a reflex arc.

What part of the nervous system integrates and interprets information from PNS sensory neurons?

Generalize the role of the lower motor neuron in motor control.

Dan injured the spinal nerves emerging from the lower lumbar and sacral region of the spinal cord during a horse-riding accident.After his injury,he reported numbness in his feet.Explain the connection between the loss of sensation he has described and the plexus responsible for serving this area.