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Electron microscope study of the endoplasmic reticulum in the muscle fibers of crabs


, : Electron microscope study of the endoplasmic reticulum in the muscle fibers of crabs. Univ Sao Paulo Fac Filos Cienc E Letras Bol Zool 23: 141-169

Ultrafine sections of muscle from the buccal parts of 2 species of crabs were examined with the electron microscope. The principal characteristics of the structure of the muscle fibers are described, with a particular emphasis on the endoplasmic reticulum. It is made up of a network of membranes located within the interior of muscular "colonnettes" [ little columns], in the interfibrillary sarcoplasm. In each sarcomere, the reticulum is divided into 3 regions of different morphology: opposite I zone and distal A zone, the reticulum is formed of a double membrane forming a kind of cuff around each myofibril, opposite the proximal A zone, it consists of tubules and vesicles with a longitudinal orientation and shows a transverse discontinuity, and opposite band H, which is formed by 3 contiguous double membranes, the reticulum seems to have both transvers and longitudinal discontinuity. These data are discussed in relation to current hypotheses as to the probable role of the endoplasmic reticulum in striated muscle.

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