El sarcoplasma es el nombre que se le da al citoplasma de las células musculares. Su contenido es comparable al del citoplasma de otras células eucarióticas. Tiene aparato de Golgi, cercano al núcleo. Tiene mitocondrias, justo por dentro de la membrana citoplasmática (el sarcolema). Tiene retículo endoplasmático liso aunque está organizado de una manera especial, una red extensa de túbulos llamados sarcotúbulos. La concentración de calcio en el sarcoplasma es también un elemento especial de la fibra muscular por medio del cual se producen y regulan las contracciones.

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Sarcoplasm is the cytoplasm of a myocyte (muscle fiber). It is comparable to the cytoplasm of other cells, but it contains unusually large amounts of glycosomes (granules of stored glycogen) and significant amounts of myoglobin, an oxygen-binding protein. The calcium ion concentration in sarcoplasma is also a special element of the muscle fiber; it is the means by which the muscle contractions take place and are regulated. It contains mostly myofibrils (which are composed of sarcomeres), but its contents are otherwise comparable to those of the cytoplasm of other cells. It has a Golgi apparatus near the nucleus, mitochondria just inside the cell membrane (sarcolemma), and a smooth endoplasmic reticulum (specialized for muscle function and called the sarcoplasmic reticulum). The words sarcoplasm and myoplasm are not synonyms, despite that etymologically they seem like they ought to be. Whereas sarcoplasm is a type of cytoplasm, myoplasm is the entire contractile portion of muscle tissue.

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