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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.

The paper summarizes the experience of Russian and foreign specialists in dealing with the theoretical and practical aspects of sacral anesthesia. It presents anatomic data and information on the pathophysiological aspects and potentialities of clinical use of sacral anesthesia in modern anesthesiological practice that estimate its perspectives at this stage.

As demonstrate measurements of 57 human sacrums, 40 of them have either complete or partial sacralization, mainly at the expense of the first coccygeal vertebra. Simultaneously, it has been revealed that in the sacrums studied certain increase of the sacral kyphosis is observed. The pick of the sacral flexure in the masculine pelvis is at the level of the II sacral vertebra, that of the feminine pelvis--at the level of the I sacral vertebra.