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chiasma |
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chiasma (kīăz`mə): see crossing over crossing over, process in genetics by which the two chromosomes of a homologous pair exchange equal segments with each other. Crossing over occurs in the first division of meiosis . ..... Click the link for more information. . |
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To more closely examine brain tissue for neuronal damage, three cross sections of brain (level of optic chiasma, caudal to mammillary bodies and caudal to transverse fibers of the pons) were stained with luxol fast blue-cresyl violet. When they do occur, mucoceles isolated to the sphenoid sinus cause symptoms related to surrounding structures that are vulnerable to compression, including the pituitary gland, optic nerve, chiasma, and the structures found within the cavernous sinus. Each heterochromatic block, through its chiasma displacement effect, can keep in its proximity certain favorable allele combinations of different genes ("coadapted gene pools") (17). |
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chiasma
