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ommatidium
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Definitions of ommatidium in various dictionaries:
noun - any of the numerous small cone-shaped eyes that make up the compound eyes of some arthropods
OMMATIDIUM - The compound eyes of arthropods like insects, crustaceans and millipedes are composed of units called ommatidia (singular: ommatidium). An ommatidium...
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One of the structural elements, resembling a single simplified eye, that make up the compound eye of insects and other arthropods. |
any of the numerous small cone-shaped eyes that make up the compound eyes of some arthropods |
Ommatidium description |
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The compound eyes of arthropods like insects, crustaceans and millipedes are composed of units called ommatidia (singular: ommatidium). An ommatidium contains a cluster of photoreceptor cells surrounded by support cells and pigment cells. The outer part of the ommatidium is overlaid with a transparent cornea. Each ommatidium is innervated by one axon bundle (usually consisting of 6-9 axons, depending on the number of rhabdomeres) and provides the brain with one picture element. The brain forms an image from these independent picture elements. The number of ommatidia in the eye depends upon the type of arthropod and may be as low as 5 as in the Antarctic isopod Glyptonotus antarcticus or range from just a handful in the primitive Zygentoma to around 30 thousand in larger Anisoptera dragonflies as well as in some Sphingidae moths.Ommatidia are typically hexagonal in cross section and approximately ten times longer than wide. The diameter is largest at the surface, tapering toward the |