Kiełbówna L
J Embryol Exp Morphol. 1981 Aug;64:295-304.
Myogenesis in Xenopus laevis and in Bombina variegata is similar despite differences in the structure of the nonsegmented mesoderm and in the formation of the myotomes. In X. laevis the nonsegmented mesoderm consists of two cell layers with the premyocoel between them. During somitogenesis the premyoblasts rotate covering subsequently the whole myotome length. In B. variegata the premyocoel is absent. The myotomal cells change their shape and elongate, attaining ultimately the whole myotome length. The morphologically mature mononuclear muscle cells in both species result from myogenesis beginning in similarly arranged myoblasts. The multinuclear myotubes arise in the swimming tadpole (stage 45). The structure of the nonsegmented mesoderm and of the newly formed myotomes in Pelobates fuscus is similar to that of B. variegata, while the process of myogenesis is different. It begins in the multinuclear myotubes. The stage of morphologically mature mononuclear muscle cells was not observed in the light microscope. The results suggest that myotomal myogenesis is related neither to any particular type of nonsegmented mesoderm structure nor to any specific mode of myotome formation.
尽管非洲爪蟾和东方铃蟾的非分节中胚层结构以及肌节形成存在差异，但它们的肌发生过程是相似的。在非洲爪蟾中，非分节中胚层由两层细胞组成，中间有前肌腔。在体节发生过程中，前成肌细胞旋转，随后覆盖整个肌节长度。在东方铃蟾中，没有前肌腔。肌节细胞改变形状并伸长，最终达到整个肌节长度。这两个物种中形态学上成熟的单核肌肉细胞均源于起始于排列相似的成肌细胞的肌发生过程。多核肌管出现在游动的蝌蚪（45期）中。棕背蟾蜍的非分节中胚层和新形成的肌节结构与东方铃蟾相似，而肌发生过程则不同。它起始于多核肌管。在光学显微镜下未观察到形态学上成熟的单核肌肉细胞阶段。结果表明，肌节肌发生既不与任何特定类型的非分节中胚层结构相关，也不与肌节形成的任何特定模式相关。
