Nettle leaf stinging trichome, SEM

Nettle leaf stinging trichome, SEM

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Credit: PETER BOND, EM CENTRE, UNIVERSITY OF PLYMOUTH/SCIENCE PHOTO LIBRARY

Caption: Stinging nettle (Urtica dioica) stinging trichome on a leaf, coloured scanning electron micrograph (SEM). The large spike at upper centre is a stinging trichome. The other, shorter trichomes are non-stinging ones. When brushed against, the stinging trichome breaks off and its tip penetrates the skin, injecting acetylcholine and histamine. These chemicals cause the painful and inflammatory response known as a nettle sting or rash. Magnification: x63 when printed at 10 centimetres high,

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Keywords: 1, acetylcholine, biological, biology, botanical, botany, colored, coloured, cross-section, defence mechanism, false-colored, false-coloured, flora, freeze fracture, freeze fractured, freeze-fracture, freeze-fractured, histamine, inflammation, inflammatory response, leaf, leaf hairs, nature, nettle rash, one, plant, scanning electron micrograph, scanning electron microscope, section, sectioned, sem, single, sting, stinging, stinging nettle, surface, transverse, trichome, trichomes, urtica dioica

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