Question

Lesions to CN II (optic) result in loss of the sensory limb of the light reflex. What is the effect of lesions to CN II on the light reflex?

1) The light reflex is unaffected
2) The light reflex is completely lost
3) The light reflex is partially lost
4) The light reflex is enhanced

Answer 1

Lesions to CN II (optic) cause a loss of the sensory limb of the light reflex.

Step-by-step explanation:

Lesions to CN II, which is the optic nerve, result in the loss of the sensory limb of the light reflex. The light reflex refers to the constriction of the pupils in response to light. CN II is responsible for carrying visual information from the retina to the brain. When there is damage to CN II, the sensory input necessary for the light reflex is disrupted, resulting in a loss of the reflex.