STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Nerve ending. Coloured transmission electron micrograph (TEM) of a section through a sensory nerve ending in the penis. The nerve fibre (centre) is in a fibroblast capsule (pink). The fibre consists of a nerve cell axon (irregular oval), the output process of a nerve cell, and Schwann cells (with dark green nuclei). Around the fibre is fibroelastic connective tissue containing fibroblasts and collagen (brown). Collagen is often associated with elastic fibres, which are common in this highly elastic organ. Nerves collect, interpret and relay information to other parts of the body, such as the muscles and organs. Magnification: x2,300 at 6x7cm size.
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