é
-Bilateral transection of the nerve indicated by the arrow

Question

Quizplus · Accepted Answer

Bilateral transection of the nerve indicated by the arrow refers to the optic nerve, which carries visual information to the brain. Damage to this nerve eliminates the ability of light to entrain circadian rhythms, indicating choice D as the best answer. Choices A and B are incorrect as they refer to structures (optic tract and fornix) that are not affected by the transection. Choice C is also incorrect as circadian rhythms are produced by the suprachiasmatic nucleus (SCN), which is not affected by the transection. Choice E is incorrect as sleep is not solely controlled by the optic nerve.

é -Bilateral Transection of the Nerve Indicated by the Arrow