Crossed 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

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

Explanation:
Crossed fibers from the optic tract carry the opposite-eye input and terminate in the LGN layers that receive contralateral input, preserving separate monocular channels. In the LGN, the contralateral eye projects to layers 1, 4, and 6, while the ipsilateral eye projects to layers 2, 3, and 5. So the fibers that cross at the optic chiasm do not terminate in the layer that receives input from the same side—the layer that does not get crossed input is the one corresponding to layer 2.

Crossed fibers from the optic tract carry the opposite-eye input and terminate in the LGN layers that receive contralateral input, preserving separate monocular channels. In the LGN, the contralateral eye projects to layers 1, 4, and 6, while the ipsilateral eye projects to layers 2, 3, and 5. So the fibers that cross at the optic chiasm do not terminate in the layer that receives input from the same side—the layer that does not get crossed input is the one corresponding to layer 2.

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