Morfologiia 1996 Jan 01;1106:60-4.

[The ultrastructure of the neuromuscular synapses at different stages in the development of the embryos and tadpoles of the clawed toad].

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Myoneural synapses were studied in embryos and tadpole of Xenopus laevis on different stages of development using light and electron microscopy. On embryonal stages, during hatching and on stages of tadpole myoneural synapses vary in in appearance, number of organelles and extent of formation of different synaptic specialisations. During the process of myoneural contacts forming in the development of amphibians, terminal is the first to form, followed by the Schwann cell, that covers it, and postsynaptic plication forms in the last turn. When the embryo of Xenopus laevis becomes a tadpole some of its terminals contain significant number of large synaptic vesicles united into clusters both in cytoplasm and near to active zones (together with small ones). This heterogeneity was not found on earlier stages. A suggestion is made on possible participation of two different axons in the innervation of myotomic muscular fibres of tadpole of Xenopus laevis.

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