词汇 | chiasm |
释义 | chiasm noun[ Cusually singular ] anatomy specializeduk /ˈkaɪ.æz.əm/ us /ˈkaɪ.æz.əm/ an instance of two structures in the body crossing and forming an X, especially the optic chiasm(= the connection in the brain between the two optic nerves that connect the eyes to the brain and allow you to see with both eyes together): You can see the chiasm where two tendons cross. The organs at risk in this localization are the optical nerves and chiasm. This area is devoid of cell nuclei in the chiasm. Optic nerves, chiasm, optic tract, and central optic pathway showed no significant alterations. The axial twist hypothesis could help explain the chiasm of the trochlear nerve. The eye & surrounding area beadily beetling canthus chiasma ciliary compound eye eyeball eyelid glassy macula macula lutea macular monobrow oculomotor optic nerve suborbital superciliary supraoptic supraorbital tear duct You can also find related words, phrases, and synonyms in the topics: The brain & nervous system Synonymchiasma Related wordoptic chiasm Examples of chiasmchiasm Visual processing of the text begins in the retina and progresses by way of the optic nerve to the optic chiasm and then the optic tract. A 5-mm hole was drilled in the skull either directly over bregma for optic chiasm recordings or 1.5 mm lateral to bregma for optic tract recordings. Electrodes were advanced into the brain either 0.5 mm anterior to bregma (optic chiasm) or 1.5 mm lateral to bregma (optic tract) through a protective guide tube. Pathfinding at the mammalian optic chiasm. In eutherian mammals, axons originating from temporal retina travel intermingled with the main body of the optic nerve up to the midline of the optic chiasm where decussation takes place. For electrical stimulation of the optic chiasm, a low-impedance bipolar electrode was implanted and fixed to the skull with dental acrylic cement. During development, axons from the temporal retina make an abrupt turn within the chiasm. Stereoperception in cats following section of the corpus callosum and 0or the optic chiasm. Immunoreactivity is strong on the interfascicular glia throughout the optic nerve, but is poor in the central chiasm. These monocular regions received transneuronal input from the contralateral eye, indicating that a small population of temporal ganglion cells erroneously decussated at the optic chiasm. The underlying optic chiasm was then cut in the midsagittal plane. This shows that the time necessary for the terminalisation of chiasms and separation of homologous chromosomes can be greatly shortened. Postsynaptic potentials recorded in neurons of the cat's lateral geniculate nucleus following electrical stimulation of the optic chiasm. However, such dual innervation is rare, and we did not observe dual optic chiasm latencies for any of the geniculate cells in this study. Domains of regulatory gene expression and the developing optic chiasm: correspondence with retinal axon paths and candidate signaling cells. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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