OPTIC CHIASM
\ˈɒptɪk t͡ʃˈa͡ɪəzəm], \ˈɒptɪk tʃˈaɪəzəm], \ˈɒ_p_t_ɪ_k tʃ_ˈaɪ_ə_z_ə_m]\
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By Princeton University
By DataStellar Co., Ltd
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The X-shaped structure formed by the meeting of the two optic nerves. At the optic chiasm the fibers from the medial part of each retina cross to project to the other side of the brain while the lateral retinal fibers continue on the same side. As a result each half of the brain receives information about the contralateral visual field from both eyes.
By DataStellar Co., Ltd
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The optic commissure, consisting of a decussation of the two optic tracts in front of the tuber cinereum. The decussation is said to be complete in most animals, but in man some of the fibers of each tract do not cross over to be continuous with the opposite optic nerve, but either pass across to enter the opposite tract or are continuous with the nerve of the same side. [Gr.]
By Smith Ely Jelliffe
