The sarcoplasmic reticulum in muscle cells of amblystoma larvae
The sarcoplasmic reticulum in muscle cells of amblystoma larvae
复制标题
DOI：
10.1083/jcb.2.4.163
复制
发表时间：
1956-01-01
期刊：
影响因子：
--
通讯作者：
PORTER, KEITH R.
中科院分区：
文献类型：
--
作者：
PORTER, KEITH R.
电子显微镜下的肌纤维薄切片的Amblystoma幼虫的肌节揭示了存在一个复杂的，膜限制的小管和囊泡系统，形成一个花边状的网状周围和肌原纤维之间。这似乎与早期光学显微镜下的肌浆网和其他细胞类型的内质网相对应。构成网的成分以一种与相邻肌原纤维的条带具有恒定关系的模式排列，因此在每个肌节中重复。在H波段，系统是横向连续的，但在其他水平上不是这样。纵向上，连续性在Z带处中断，其中属于系统的相邻肌节段的大囊泡在带的相对侧上面对。这些囊泡的相对面是平坦的，并且被或多或少恒定宽度的空间分开，其中定位有小的指状囊泡。考虑到这些和其他与肌原纤维的密切结构关系，将兴奋性冲动的传导作用归于该系统似乎是合适的。|| 摘要认证：Auth. Summ
Electron microscopy of thin sections of muscle fibers in myotomes of Amblystoma larvae has revealed the presence of a complex, membrane-limited system of canaliculi and vesicles which form a lace-like reticulum around and among the myofibrils. This seems to correspond to the sarcoplasmic reticulum of the earlier light microscopists and the endoplasmic reticulum of other cell types. The elements consitituting the reticulum are disposed in a pattern which bears a constant relation to the bands of the adjacent myofibrils and is therefore repeated in each sarcomere. At the H band the system is transversely continuous but not so at other levels. Longitudinally, continuity is interrupted at the Z bands where large vesicles belonging to adjacent sarcomere segments of the system face off on opposite sides of the band. The opposing faces of these vesicles are flat and separated by a space of more or less constant width, in which are located small, finger-shaped vesicles. In view of these and other close structural relation-ships with the myofibrils it seems appropriate to assign to the system a role in the conduction of the excitatory impulse. || ABSTRACT AUTHORS: Auth. summ