Chiasm
Chiasm
Chiasm (pronunciation: /ˈkaɪˌæzəm/) is a term used in various fields of study, including anatomy, genetics, and literature. In each field, the term has a unique meaning, but all definitions share a common theme of crossing or intersection.
Etymology
The term "chiasm" is derived from the Greek letter Chi (Χ), which is shaped like an 'X'. This shape is representative of the crossing or intersection that is characteristic of a chiasm.
Anatomy
In anatomy, a chiasm refers to the point where the optic nerves from each eye cross over each other. This point is known as the optic chiasm. The optic chiasm is a crucial part of the visual system, as it allows for binocular vision and depth perception.
Genetics
In genetics, a chiasm refers to the point where two chromosomes cross over each other during meiosis. This process, known as chromosomal crossover, results in the exchange of genetic material between the two chromosomes, leading to genetic diversity in offspring.
Literature
In literature, a chiasm refers to a specific type of rhetorical structure. A chiastic structure involves the repetition of ideas or themes in reverse order. This structure is often used for emphasis or to highlight a contrast or comparison.
Related Terms
External links
- Medical encyclopedia article on Chiasm
- Wikipedia's article - Chiasm
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