Sonoda M, Moriya H, Shimada Y
Department of Anatomy/Cell Biology, School of Medicine, Chiba University, Japan.
Microsc Res Tech. 1993 Feb 15;24(3):281-6. doi: 10.1002/jemt.1070240306.
The transverse (T) tubules and the sarcoplasmic reticulum (SR) at the myotendinous junction of stretched rat skeletal muscle were examined by conventional and intermediate voltage electron microscopy. Stretching induced a large cytoplasmic space devoid of myofibrils at the ends of lengthening fibers. In this space, irregularly running tubular elements were seen. They were connected both with subsarcolemmal caveolae and with T tubules traversing to the A-I junctional level of the preexisting myofibrils. The SR was arranged at regular intervals which were narrower than those of the adult sarcomere. This orderly spacing of the SR seems to indicate that they may play some role(s) in myofibril assembly and/or T tubule arrangement.
采用传统电子显微镜和中压电子显微镜对拉伸大鼠骨骼肌肌腱连接处的横管（T管）和肌浆网（SR）进行了检查。拉伸导致延长纤维末端出现一个没有肌原纤维的大细胞质空间。在这个空间中，可以看到不规则排列的管状结构。它们既与肌膜下小窝相连，也与穿过到原有肌原纤维A-I连接水平的T管相连。肌浆网以规则的间隔排列，这些间隔比成年肌节的间隔更窄。肌浆网这种有序的间距似乎表明它们可能在肌原纤维组装和/或T管排列中发挥某些作用。
