STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Skeletal muscle fibre. Coloured scanning electron micrograph (SEM) of a freeze-fractured skeletal (or striated) muscle fibre. The fracturing of the fibre has revealed that it consists of a bundle of myofibrils (red). The fibre has a sheath of connective tissue (endomysium) that is seen as the strands (yellow) scattered around the image. Skeletal muscle is under voluntary control. Magnification unknown.
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