A fine reticular network of membrane-limited elements that pervades the sarcoplasm of a muscle cell; continuous over large portions of the cell and with the nuclear envelope; that part of the endoplasmic reticulum specialized for calcium release, uptake and storage. [ GOC:mtg_muscle https://www.worldcat.org/search?q=bn%3A0198547684 https://www.worldcat.org/search?q=bn%3A0124325653 ]
Term information
See also the cellular component terms 'sarcoplasm ; GO:0016528', 'nuclear envelope ; GO:0005635' and 'endoplasmic reticulum ; GO:0005783'.