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chiasm |
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chiasm /chi·asm/ (ki´azm) a decussation or X-shaped crossing. optic chiasm the structure in the forebrain formed by the decussation of the fibers of the optic nerve from each half of each retina. chiasm [kī′azəm] Etymology: Gk, chiasma, lines that cross 1 the crossing of two lines or tracts, as of the optic nerves at the optic chiasm. 2 (in genetics) the crossing of two chromatids in the prophase of meiosis. chiasmal, chiasmic, adj. chiasm a decussation or Y-shaped crossing. optic chiasm a structure in the forebrain formed by the decussation of fibers of the optic nerve from each half of each retina. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Only a little has been done with word order (Kwong; Porter)--foregrounding and back-grounding, emphasis, elision, chiasm of sounds, audible parallelisms and transitions, verbal threads, and so on. The tumor's location between the carotid artery, optic chiasm, pituitary gland, and cavernous sinus made en bloc resection impossible. It is a chiasm, with the typical ABCDCBA structure. |
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