05-21-2004, 03:31 AM
mumbai
Morris is a 79-year-old man who was brought to the emergency room (ER) because his family was worried that he suddenly was not using his right arm and leg, and seemed to have a simultaneous behavior change. He was unable to write a reminder note to himself, even with his left hand, and he put his shoes on the wrong feet. A neurologist was called to the ER to examine the patient. A loud bruit (pronounced as bru-¯e; a rumbling sound) was heard with a stethoscope over the left carotid artery in his neck. When asked to show the neurologist his left hand, he pointed to his right hand, since it could not move. The neurologist asked him to add numbers, and he was unable to do this, despite having spent his life as a bookkeeper. Morris was unable to name the fingers on either hand, and he could not form any semblance of a letter, using his left hand. His eyes did not blink when the neurologist waved his hands close to Morris' eyes in the left temporal and right nasal visual fields. The right lower two-thirds of his face drooped. There was some asymmetry of his reflexes between the right and left sides, and there was a positive Babinski response of his right toe.
Damage to which structure caused the visual defect?
Answer Choices : Correct answer : Your answer
A. Right optic nerve
B. Left optic nerve
C. Optic chiasm
D. Right optic radiations
E. Left optic radiations
Morris is a 79-year-old man who was brought to the emergency room (ER) because his family was worried that he suddenly was not using his right arm and leg, and seemed to have a simultaneous behavior change. He was unable to write a reminder note to himself, even with his left hand, and he put his shoes on the wrong feet. A neurologist was called to the ER to examine the patient. A loud bruit (pronounced as bru-¯e; a rumbling sound) was heard with a stethoscope over the left carotid artery in his neck. When asked to show the neurologist his left hand, he pointed to his right hand, since it could not move. The neurologist asked him to add numbers, and he was unable to do this, despite having spent his life as a bookkeeper. Morris was unable to name the fingers on either hand, and he could not form any semblance of a letter, using his left hand. His eyes did not blink when the neurologist waved his hands close to Morris' eyes in the left temporal and right nasal visual fields. The right lower two-thirds of his face drooped. There was some asymmetry of his reflexes between the right and left sides, and there was a positive Babinski response of his right toe.
Damage to which structure caused the visual defect?
Answer Choices : Correct answer : Your answer
A. Right optic nerve
B. Left optic nerve
C. Optic chiasm
D. Right optic radiations
E. Left optic radiations