chiasma 的定义
plural chi·as·mas, chi·as·ma·ta [kahy-az-muh-tuh]. /kaɪˈæz mə tə/.
- Anatomy. a crossing or decussation, as that of the optic nerves at the base of the brain.
- Cell Biology. a point of overlap of paired chromatids at which fusion and exchange of genetic material take place during prophase of meiosis.
更多chiasma例句
- We know that they are directly connected by fibres that arch round through the chiasma.
- Pressure on the optic chiasma, for example by a tumour of the pituitary body, is associated with bilateral temporal hemianopsia.
- At the base of the section are seen the optic nerves and their chiasma.
- The optic chiasma, where present, is involved in the floor of the thalamencephalon and forms a large, upwardly-projecting ridge.
- The nerves are fibrous, and a commencement of the chiasma is certainly present.