Institut de Neurosciences, Department de Cytologie, UA CNRS 1199, 7 Quai Saint Bernard, 75252, Paris Cedex 05 France.
Tissue Cell. 1989;21(6):875-89. doi: 10.1016/0040-8166(89)90039-6.
The formation and development of the dorsal longitudinal flight muscles of the butterfly Pieris brassicae L have been studied by electron and light microscopy. These imaginal muscles arise from two symmetrical pairs of mesothoracic larval muscles, which are morphologically indistinguishable from the other wall muscles at the beginning of the 5th larval instar. However, 2 days before the end of this instar an accumulation of myoblasts is observed at the median region of these muscle fibres. The muscle fibres are penetrated by the myoblasts and broken into fragments. Progressive dedifferentiation of the larval fibrillar material in each of the muscle fragments is observed during the first days of the pupal development. The myoblasts within the basal lamina of the original larval muscle fibres remain associated with the muscle fragments. Myoblasts then fuse with the larval muscle fragments, which simultaneously fuse with each other. This results in the formation of rudimentary imaginal muscle fibres. The development of these fibres, particularly myofibrillogenesis, is studied until the emergence of the imago.
蝴蝶 Pieris brassicae L 的背纵飞行肌的形成和发育已通过电子显微镜和光学显微镜进行了研究。这些成虫肌肉起源于两个对称的中胸幼虫肌肉对，在第 5 龄幼虫初期，它们在形态上与其他壁肌肉无法区分。然而，在这个龄期结束前 2 天，在这些肌肉纤维的中央区域观察到肌母细胞的积累。肌母细胞穿过肌肉纤维并将其分裂成碎片。在蛹发育的最初几天中，观察到每个肌肉片段中的幼虫纤维状物质的渐进去分化。位于原始幼虫肌肉纤维的基膜内的肌母细胞仍然与肌肉片段相关联。肌母细胞然后与幼虫肌肉片段融合，同时彼此融合。这导致了原始的成虫肌肉纤维的形成。这些纤维的发育，特别是肌原纤维的形成，一直研究到成虫出现。
