When light is shone into one eye, the pupil

safaTerkawi

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2022-08-10

When light is shone into one eye, the pupil.

Constricts even though its optic nerve has been cut.
Responds due to sympathetic nerve activity.
Does not respond if autonomic cholinergic nerves are blocked by local application of atropine.
In that eye constricts and the opposite pupil dilates.
Does not respond if there is brainstem death.

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safaTerkawi

2022-08-10

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A. False The optic nerve is an essential part of the reflex pathway for the light reflex.

B. False It still constricts after the sympathetic nerves are cut.

C. True Atropine blocks this parasympathetic action.

D. False Both pupils constrict consensually.

E. True Failure of the pupils to respond to light is a sign of brainstem death

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