Kryvi H
Cell Tissue Res. 1977 Nov 7;184(3):287-300. doi: 10.1007/BF00219891.
Red, intermediate and white axial muscle fibres of the sharks Etmopterus spinax and Galeus melastomus were studied by electron microscopy and morphometry. The mitochondrial content is more than thirty percent in red, less than one percent in white, and up to fifteen percent in intermediate fibres. About one third of the mitochondria in red fibres are accumulated close to the sarcolemma. Red fibres contain much glycogen, present as rosettes (alpha particles). Intermediate fibres contain less glycogen (as beta particles). White fibres have scarcely any visible energy reserves. Red fibres contain slightly less (4-5%) of the sarcotubular system than the other fibre types (6-8%). In all fibre types, the terminal cisternae of the SR are regularly divided by clefts. Triads or dyads are generally positioned at the Z discs, but in Galeus white fibres two dyads may be present, one on each side of the Z disc. The morphology is discussed in relation to current views on the functions of different muscle fibre types.
利用电子显微镜和形态测量学方法，对斑点灯笼棘鲛（Etmopterus spinax）和黑鳍基齿鲨（Galeus melastomus）的红色、中间型和白色轴肌纤维进行了研究。红色纤维中线粒体含量超过30%，白色纤维中不到1%，中间型纤维中高达15%。红色纤维中约三分之一的线粒体聚集在肌膜附近。红色纤维含有大量糖原，呈玫瑰花结（α颗粒）形式存在。中间型纤维含有较少的糖原（呈β颗粒形式）。白色纤维几乎没有可见的能量储备。红色纤维的肌管系统比其他纤维类型略少（4-5%）（其他纤维类型为6-8%）。在所有纤维类型中，肌浆网的终池被裂缝规则地分隔。三联体或二联体通常位于Z线处，但在黑鳍基齿鲨的白色纤维中可能存在两个二联体，分别位于Z线的两侧。结合当前关于不同肌肉纤维类型功能的观点对形态学进行了讨论。
