Uncrossed 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

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

Explanation:
Uncrossed fibers come from the temporal retina and stay on the same side, heading to the LGN layers that represent the ipsilateral eye. In the LGN, inputs from each eye are segregated into alternating layers. The layers that receive input from the ipsilateral eye are the ones carrying the uncrossed signal, typically layers 2, 3, and 5. Layers 1, 4, and 6 receive input from the contralateral eye (the crossed fibers from the nasal retina). So uncrossed fibers do not synapse in the first layer; they synapse in layers 2, 3, and 5. The layer that does not receive uncrossed input is the first layer.

Uncrossed fibers come from the temporal retina and stay on the same side, heading to the LGN layers that represent the ipsilateral eye. In the LGN, inputs from each eye are segregated into alternating layers. The layers that receive input from the ipsilateral eye are the ones carrying the uncrossed signal, typically layers 2, 3, and 5. Layers 1, 4, and 6 receive input from the contralateral eye (the crossed fibers from the nasal retina). So uncrossed fibers do not synapse in the first layer; they synapse in layers 2, 3, and 5. The layer that does not receive uncrossed input is the first layer.

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