Duvert M, Barets A L
Z Naturforsch C Biosci. 1979 Sep-Oct;34(9-10):865-75. doi: 10.1515/znc-1979-9-1033.
The ultrastructure of the sarcoplasmic reticulum (SR) of the sino-auricular fibres of frog heart has been investigated especially in order to evaluate its possible relationship with several cellular organelles. The SR appears as a complex unit which can be divided into three regions:--peripheral SR, localized beneath the sarcolemma. It is composed of junctional SR, which forms specialized complexes (couplings) with the sarcolemma, and peripheral SR s. str. which frequently extends its anastomotic tubules around the caveolae.--juxtafibrillar SR, in relation with myofibrils, at the level of Z lines and I bands.--intermediary SR which is the most abundant. It contains dense granules, able to bind strontium (and calcium) and, from place to place, is formed into flattened saccules bearing fenestrations where microfilaments frequently pass through. It allows peripheral SR and juxtafibrillar SR to communicate, giving unity to the reticular system and, on the other hand, shows close topographical relations with mitochondria. The great extension of the SR, its heterogeneity and its relationships with several cellular organelles, especially mitochondria, are interpreted from the functional point of view.
为了评估蛙心窦房纤维肌浆网（SR）与几种细胞器可能存在的关系，对其超微结构进行了研究。肌浆网呈现为一个复杂的单位，可分为三个区域：——外周肌浆网，位于肌膜下方。它由连接肌浆网组成，连接肌浆网与肌膜形成特殊的复合体（连接），以及外周肌浆网的连续结构，其吻合小管经常围绕小凹延伸。——近纤维肌浆网，在Z线和I带水平与肌原纤维相关。——中间肌浆网，最为丰富。它含有致密颗粒，能够结合锶（和钙），并在不同部位形成带有小孔的扁平囊泡，微丝经常穿过这些小孔。它使外周肌浆网和近纤维肌浆网相互连通，使网状系统成为一个整体，另一方面，它与线粒体呈现出紧密的位置关系。从功能角度对肌浆网的广泛延伸、其异质性以及它与几种细胞器尤其是线粒体的关系进行了解释。
