[Regularities of morphogenesis of the sacrourothelial joint in Anura].

The regularities in the formation of different types of Anura sacrourothelial joints have been determined. A review of factors that affect the form of this joint is presented. It has been established that the determinant role in the formation of a moveable or immoveable joint is played by the topography and time of the appearance of musces in the sacrourothelial area. The proposed mechanisms explain not only the diversity of structural norms depending on this feature, but also options of individual variability.