Crossed fibers of the optic tract synapse in all of the following LGN layers except _______________.

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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 synapse in all of the following LGN layers except _______________.

Explanation:
Crossed (nasal retina) fibers from the optic tract project to the contralateral eye’s LGN layers, while non-crossed fibers project to the ipsilateral eye’s LGN layers. In primates, the contralateral input goes to layers 1, 4, and 6 of the LGN, whereas layers 2, 3, and 5 receive input from the ipsilateral eye. Therefore, crossed fibers do not synapse in layer 2.

Crossed (nasal retina) fibers from the optic tract project to the contralateral eye’s LGN layers, while non-crossed fibers project to the ipsilateral eye’s LGN layers. In primates, the contralateral input goes to layers 1, 4, and 6 of the LGN, whereas layers 2, 3, and 5 receive input from the ipsilateral eye. Therefore, crossed fibers do not synapse in layer 2.

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