sarcoplasmic reticulum

reticulum

 [rĕ-tik´u-lum] (L.)

1. a small network, especially a protoplasmic network in cells.

2. reticular tissue.

agranular reticulum smooth-surfaced endoplasmic reticulum.

endoplasmic reticulum an ultramicroscopic organelle of nearly all higher plant and animal cells, consisting of a system of membrane-bound cavities in the cytoplasm, occurring in two types: granular or rough-surfaced, bearing large numbers of ribosomes on its outer surface, and agranular or smooth-surfaced.

granular reticulum rough-surfaced endoplasmic reticulum.

sarcoplasmic reticulum a form of agranular reticulum in the sarcoplasm of striated muscle, comprising a system of smooth-surfaced tubules surrounding each myofibril.

sar·co·plas·mic re·tic·u·lum

the agranular endoplasmic reticulum of skeletal and cardiac muscle; the complex of vesicles, tubules, and cisternae forming a continuous structure around striated myofibrils, with a repetition of structure within each sarcomere.

sarcoplasmic reticulum

n.

The form of endoplasmic reticulum found in striated muscle fibers.

sar·co·plas·mic re·tic·u·lum

(sahr'kō-plaz'mik rĕ-tik'yū-lŭm)

The endoplasmic reticulum of skeletal and cardiac muscle; the complex of vesicles, tubules, and cisterns forming a continuous structure around striated myofibrils, with a repetition of structure within each sarcomere.

sarcoplasmic reticulum

The endoplasmic reticulum of a muscle cell which stores and releases calcium ions.

sarcoplasmic reticulum

the cysternae of a single muscle fibre, equivalent to the ENDOPLASMIC RETICULUM of other cells.