Definition of ommatidium in English:
noun (plural ommatidia-ˈtidēə)Entomology
Each of the optical units that make up a compound eye, as of an insect.
- In contrast, myriapods and chelicerates mostly lack compound eyes and the ommatidia of the few groups that have compound eyes are very different from insect/crustacean ommatidia.
- In all these animals, the larval eye continues to exist as part of the adult eye, although the number of ommatidia in the adult compound eye far exceeds the larval quantity.
- The retina of the compound eye is organized into approximately 3000 functional units or ommatidia, each containing eight photoreceptor cells.
- Example sentences
- The hyperactivation of the Sevenless RTK-signaling pathway in the Drosophila eye causes the ommatidial precursors to differentiate as neurons and results in a rough eye phenotype.
- The receptors of the midband which, based on structural evidence, are thought to be specialized to detect and analyze polarized light are in the two most ventral ommatidial rows.
- However, ommatidial rotation is abnormal in GMR-upd compared to wild type, which is best assessed in the schematics of the WT and GMR-upd adult sections.
Late 19th century: modern Latin, from Greek ommatidion, diminutive of omma, ommat- 'eye'.
Definition of ommatidium in:
- British & World English dictionary
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