…is an independent unit (the ommatidium), which views the light from a small region of the outside world. In superposition eyes the optical elements do not act independently; instead, they act together to produce a single erect image lying deep in the eye.

The ommatidium is derived from cell clusters that arise deep within the morphogenetic furrow. As undifferentiated cells are incorporated into the rolling furrow a subset of them are organized into periodic clusterings of approximately twenty cells called rosettes.

An ommatidium is a single unit of the compound eye. Because each ommatidium contains multiple spectral receptor classes, it is possible that color can be perceived within a single ommatidium. To test this hypothesis, we measured the smallest size of colored target that trained butterflies could discriminate from a gray target of equal ...

The meaning of OMMATIDIUM is one of the elements corresponding to a small simple eye that make up the compound eye of an arthropod.

As the name suggests, compound eyes are composed of many similar, closely-packed facets (called ommatidia) which are the structural and functional units of vision. The number of ommatidia varies considerably from species to species: some worker ants have fewer than six while some dragonflies may have more than 25,000.

ommatidium (pl. ommatidia) any of the numerous facets which make up the compound eye of insects and other arthropods. Each ommatidium has its own lens and is composed of a group of retinal cells surrounded by pigment cells.

In apposition compound eyes each lens with its associated photoreceptors is an independent unit (the ommatidium), which views the light from a small region of the outside world. In superposition eyes the optical elements do not act independently; instead, they act together to produce a single erect image lying deep in the eye.

ommatidium (pl. ommatidia) any of the numerous facets which make up the compound eye of insects and other arthropods. Each ommatidium has its own lens and is composed of a group of retinal cells surrounded by pigment cells.

As previously discussed, an ommatidium is the major modular structural unit of the compound eye. Each ommatidium of the housefly is equipped with a cutinous, hexagonal, 25 μm diameter facet lens and a cone-shaped lens with a complement of photoreceptors, as …

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 and thus provides the brain with one picture element.