The loss of the ability of both eyes to look to the contralateral side is called
a. internuclear ophthalmoplegia. c. paralysis of horizontal gaze.
b. ophthalmoplegia. d. skew deviation.
C
Damage to the motor areas of the cerebral cortex causes the loss of the ability of both eyes to look to the contralateral side which is called paralysis of horizontal gaze. With internuclear ophthalmoplegia, the eyes are unable to look medially, but convergence may be maintained because the pathway for convergence is different from that for conjugate gaze. The medial rectus muscle is involved in internuclear ophthalmoplegia. This condition can be caused by demyelinization resulting from multiple sclerosis. Ophthalmoplegia is an abnormal condition characterized by paralysis of the motor nerves of the eye. If one eye deviates down and the other eye deviates up, it is called skew deviation. A lesion in the brainstem or cerebellum on the same side as the eye that is deviated down can cause skew deviation.
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