Fly's eye, SEM

Fly's eye, SEM

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Caption: Fly's eye. Coloured scanning electron micrograph (SEM) of a fly's compound eye. Protective bristles cover its surface. The eye is made up of numerous visual units, known as ommatidia. Each ommatidium consists of an outer cuticle covering a lens, beneath which is a group of light-sensitive cells known as the retinula. Nerve fibres from the retinula converge onto the optic nerve, relaying visual signals to the brain. The image seen by a fly is thought to be a mosaic image, poorly focused but good at detecting movements. Magnification: x88 at 6x7cm size.

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Keywords: animal, bristle, bristles, coloured, compound eye, cuticle, fly, hair, hairs, insect, insecta, invertebrate, invertebrates, lens, lenses, many, mosaic, multiple, nature, ommatidia, ommatidium, protection, protective, scanning electron micrograph, sem, sense, sensory, sight, units, vision, visual unit, wildlife, zoology

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