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chiasm
chi·as·ma C0283900 (kī-ăz′mə) also chi·asm (kī′ăz′əm)n. pl. chi·as·ma·ta (-mə-tə) or chi·as·mas also chi·asms 1. Anatomy A crossing or intersection of two tracts, as of nerves or ligaments.2. Genetics The point of contact between paired chromatids during meiosis, resulting in a cross-shaped configuration and representing the cytological manifestation of crossing over.
[Greek khīasma, cross-piece, from khīazein, to mark with an X, from khei, khī, chi (from the letter's shape).]
chi·as′mal, chi·as′mic, chi′as·mat′ic (-măt′ĭk) adj.Thesaurus| Noun | 1. | chiasm - an intersection or crossing of two tracts in the form of the letter Xchiasma, decussationanatomical structure, bodily structure, body structure, complex body part, structure - a particular complex anatomical part of a living thing; "he has good bone structure"chiasma opticum, optic chiasm, optic chiasma - the crossing of the optic nerves from the two eyes at the base of the brain |
TranslationsEncyclopediaSeechiasmachiasm
chiasm [ki´azm] a decussation or X-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. chi·asm (kī'azm), 1. An intersection or crossing of two lines. 2. In anatomy, a decussation or crossing of two fibrous bundles, such as tendons, nerves, or tracts. 3. In cytogenetics, the site at which two homologous chromosomes make contact (thus appearing to be crossed), enabling the exchange of genetic material during the prophase stage of meiosis. Synonym(s): chiasma [TA] [G. chiasma] chi·asm (kīazm) 1. An intersection or crossing of two lines. 2. anatomy a decussation or crossing of two fibrous bundles, such as tendons, nerves, or tracts.
Synonym(s): chiasma. 3. cytogenetics the site at which two homologous chromosomes make contact (thus appearing to be crossed), enabling the exchange of genetic material during the prophase stage of meiosis.
Synonym(s): Budd syndrome. [G. chiasma]chi·asm , chiasma (kīazm, kī-azmă) In anatomy, decussation or crossing of two fibrous bundles, such as tendons, nerves, or tracts. [G. chiasma]chiasm
Synonyms for chiasmnoun an intersection or crossing of two tracts in the form of the letter XSynonymsRelated Words- anatomical structure
- bodily structure
- body structure
- complex body part
- structure
- chiasma opticum
- optic chiasm
- optic chiasma
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