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State the two nerves responsible for the consensual light reflex

Question

State the two nerves responsible for the consensual light reflex

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Solution

The two nerves responsible for the consensual light reflex are the optic nerve (cranial nerve II) and the oculomotor nerve (cranial nerve III).

Here's a step-by-step explanation:

  1. The optic nerve (cranial nerve II) senses light entering the eye. This nerve carries visual information from the retina to the brain.

  2. The brain processes this information and sends a signal via the oculomotor nerve (cranial nerve III) to the muscles that control the size of the pupil.

  3. The oculomotor nerve causes the pupil to constrict in response to bright light, reducing the amount of light that enters the eye. This is known as the pupillary light reflex.

  4. The consensual light reflex refers to the response of the opposite pupil to constrict when light is shone into one eye. This is also mediated by the optic and oculomotor nerves. When light is shone into one eye, both pupils constrict. This is because the signal from the optic nerve of the eye exposed to light is also sent to the oculomotor nerve of the other eye.

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