Which nerves are responsible for pupillary reaction?

The correct choice highlights the involvement of cranial nerves that play a crucial role in the pupillary reaction, specifically the optic nerve and the oculomotor nerve.

The optic nerve (cranial nerve II) is responsible for transmitting visual information from the retina to the brain. This input is fundamental for the reflexive response of the pupils to light, as the brain processes visual cues and then determines the appropriate pupillary reaction.

The oculomotor nerve (cranial nerve III) controls the muscles that constrict the pupil. When exposed to light, the oculomotor nerve sends signals to the iris sphincter muscle to induce constriction, resulting in the pupillary reflex.

In summary, the optic nerve provides the necessary sensory input regarding light levels, while the oculomotor nerve is essential for executing the motor response of the pupils. This interplay is critical for proper pupillary reaction and reflexes in response to changes in light intensity.