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Chapter 12: The Vestibular System and Eye Movements

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After a brain stem stroke, a person experiences vertigo. Which of the listed arteries likely produced this neurological sign?

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A. Superior cerebellar

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B. Posterior inferior cerebellar

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C. Vertebral

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D. Posterior spinal

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Comment: The posterior spinal artery supplies the dorsolateral medulla, but caudal to the vestibular nuclei. The anterior inferior cerebellar artery supplies more rostral portions of the vestibular complex.

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The ascending vestibular pathway projects to the _______ nucleus of the thalamus, where __________ information is integrated with vestibular sensory messages for perception.

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A. ventral posterior; proprioceptive

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B. medial geniculate; auditory

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C. medial dorsal; cognitive

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D. ventral posterior; visceral sensory

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The vestibulospinal tracts are part of which of the following descending systems?

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A. Lateral

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B. Medial

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C. Ventral

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D. Lateral and medial

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Comment: Despite its name, the lateral vestibulospinal tract is a medial pathway.

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Ocular depression is produced by contraction of which of the following extraocular muscles?

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A. Inferior rectus

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B. Inferior rectus and medial rectus

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C. Inferior rectus and inferior oblique

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D. Inferior rectus and superior oblique

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A person has a lesion that damaged the oculomotor nerve. Which of the following best describes the position of the affected eye in this person?

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A. Elevated and adducted

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B. Elevated and abducted

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C. Depressed and abducted

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D. Depressed and adducted

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Comment: Eye position after third nerve lesion is considered "down and out."

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Palsy of the fourth nerve does not produce _________.

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A. horizontal diplopia

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B. tortional diplopia

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C. a head tilt away from the affected eye to compensate for weakened ocular intortion

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D. vertical diplopia that becomes worse when ...

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