This basic science study describes the ultrastructural appearance of corbular sarcoplasmic reticulum in rabbit cardiac muscle using freeze-fracture techniques.
A number of investigators have demonstrated by thin-section electron microscopy the presence of "coated dense vesicles" associated with the sarcoplasmic reticulum (SR) of mammalian cardiac muscle. The similarity of such vesicles to junctional SR (JSR) has been reported: They are at¬tached to SR tubules, they have "feet" at their cytoplasmic surface, and they contain electron-dense material (Fig. 1). Accordingly, and In con¬sideration of their shape, they have been named corbular SR (CSR). We here report the freeze-fracture appearance of the SR, especially the CSR, in the rabbit heart.
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Dolber et al. (1980) studied this question.
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