CNRI / SCIENCE PHOTO LIBRARY CNRI / SCIENCE PHOTO LIBRARY
False-colour transmission electron micrograph of a longitudinal section through striated skeletal muscle. Striated muscle is composed of parallel bundles of multinucleate fibres, each composed of a number of myofibrils. This image shows a section through several myofibrils (pink), each surrounded by a network of membranous vesicles known as the sarcoplasmic reticulum (yellow). The myofibrils are, in turn, composed of contractile proteins arranged in thin threads called myofilaments (visible here as fine, pink, stripes). The presence of two different types of protein causes the blue cross-banding. Magnification: x4,700 at 35mm size, x10,000 at 6x7 cm size.
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