insect-structure-04 - to ‘brain’ Detection of light...

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Insect structure and function 4 Vision The compound eyes consist of thousands of identical units called ommatidia packed together on each side of the head the cuticle here is transparent and forms a series of lenses cuticle ommatidium nerve fibres Section through a compound eye (a) cone of light enters ommatidium (b) and is refracted by cuticular lens and crystalline cone (c) and projected on to the rhabdom (d) Light travels down the rhabdom (e) stimulating the light-sensitive cells (f) which fire impulses along nerve fibres
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Unformatted text preview: to ‘brain’ Detection of light cuticular lens crystalline cone (lens) matrix cell (secretes crystalline cone) rhabdom (transparent rod) nerve fibre Components of ommatidium Image formed by compound eye The diagram shows the pattern of ommatidia which would be stimulated by the two shapes. The compound eye could not distinguish between the two shapes pattern of ommatidia stimulated pattern of light falling on the eye Fruit fly ( Drosophila ) light-sensitive cell © D.G. Mackean...
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