Uncrossed fibers of the optic tract do not synapse in which LGN layer?

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Prepare for the NBEO Ocular Anatomy Posterior Segment and Cranial Nerves Test. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

Uncrossed fibers of the optic tract do not synapse in which LGN layer?

Explanation:
Uncrossed fibers stay on the same side after the chiasm and terminate in the layers that receive input from the ipsilateral eye. The LGN is organized so that input from the opposite eye goes to layers 1, 4, and 6, while input from the same eye goes to layers 2, 3, and 5. Therefore, the uncrossed (ipsilateral) fibers do not synapse in the layer that receives contralateral input—layer one. That’s why the best answer is the first LGN layer.

Uncrossed fibers stay on the same side after the chiasm and terminate in the layers that receive input from the ipsilateral eye. The LGN is organized so that input from the opposite eye goes to layers 1, 4, and 6, while input from the same eye goes to layers 2, 3, and 5. Therefore, the uncrossed (ipsilateral) fibers do not synapse in the layer that receives contralateral input—layer one. That’s why the best answer is the first LGN layer.

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