++
Chapter 12: The Vestibular System and Eye Movements
++
++
++
After a brain stem stroke, a person experiences vertigo. Which of the listed arteries likely produced this neurological sign?
++
++
++
++
++
B. Posterior inferior cerebellar
++
++
++
++
+
++
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.
++
++
++
The ascending vestibular pathway projects to the _________ nucleus of the thalamus, where __________ information is integrated with vestibular sensory messages for perception.
++
++
++
A. ventral posterior; proprioceptive
++
++
B. medial geniculate; auditory
++
++
C. medial dorsal; cognitive
++
++
D. ventral posterior; visceral sensory
++
++
++
The vestibulospinal tracts are part of which of the following descending systems?
++
++
++
++
++
++
++
++
++
+
++
Comment: Despite its name, the lateral vestibulospinal tract is a medial pathway.
++
++
++
Ocular depression is produced by contraction of which of the following extraocular muscles?
++
++
++
++
++
B. Inferior rectus and medial rectus
++
++
C. Inferior rectus and inferior oblique
++
++
D. Inferior rectus and superior oblique
++
++
++
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?
++
++
++
++
++
++
++
C. Depressed and abducted
++
++
D. Depressed and adducted
+
++
Comment: Eye position after third nerve lesion is considered “down and out.”
++
++
++
Palsy of the fourth nerve does not produce _________.
++
++
++
++
++
++
++
C. a head tilt away from the affected eye to compensate for weakened ocular intorsion
++
++
D. vertical diplopia that becomes worse when ...