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chiasma
[ kahy-az-muh ]
noun
, plural chi·as·mas, chi·as·ma·ta [kahy-, az, -m, uh, -t, uh].
- 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.
chiasma
/ kaɪˈæzmə; ˈkaɪæzəm /
noun
- cytology the cross-shaped connection produced by the crossing over of pairing chromosomes during meiosis
- anatomy the crossing over of two parts or structures, such as the fibres of the optic nerves in the brain
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Derived Forms
- chiˈasmal, adjective
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Other Words From
- chi·asmal chi·asmic chi·as·mat·ic [kahy-az-, mat, -ik], adjective
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Word History and Origins
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Word History and Origins
Origin of chiasma1
C19: from Greek khiasma wooden crosspiece, from khiazein to mark with an X, from khi chi 1
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Example Sentences
We know that they are directly connected by fibres that arch round through the chiasma.
From Project Gutenberg
Pressure on the optic chiasma, for example by a tumour of the pituitary body, is associated with bilateral temporal hemianopsia.
From Project Gutenberg
At the base of the section are seen the optic nerves and their chiasma.
From Project Gutenberg
The optic chiasma, where present, is involved in the floor of the thalamencephalon and forms a large, upwardly-projecting ridge.
From Project Gutenberg
The nerves are fibrous, and a commencement of the chiasma is certainly present.
From Project Gutenberg
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