Which fiber group travels laterally after crossing the chiasm?

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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

Which fiber group travels laterally after crossing the chiasm?

Explanation:
After crossing at the optic chiasm, fibers from the nasal retina join the contralateral optic tract and head toward the lateral geniculate body. The tract is organized so that fibers corresponding to the inferior part of the retina—which carry information about the superior visual field—are located more laterally as they course posteriorly. Therefore, this inferior fiber group travels laterally after crossing the chiasm. This topographic arrangement helps explain how lesions along the tract or radiation produce specific visual-field deficits.

After crossing at the optic chiasm, fibers from the nasal retina join the contralateral optic tract and head toward the lateral geniculate body. The tract is organized so that fibers corresponding to the inferior part of the retina—which carry information about the superior visual field—are located more laterally as they course posteriorly. Therefore, this inferior fiber group travels laterally after crossing the chiasm. This topographic arrangement helps explain how lesions along the tract or radiation produce specific visual-field deficits.

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