The purpose of this study was to detect the anatomical regularities in the development of twin fetuses on the basis of supravital ultrasound investigations. On the material of ultrasonographic studies of twin fetuses in multiple pregnancy in 328 women of Orenburg and Orenburg region, the successive increase of the ultrasound fetometric parameters was demonstrated with the gradual decline of their increment, which was most expressed in the last month of pregnancy. Fetometric parameters were lower in monochorial twins and in peripheral (and especially marginal) attachment of the umbilical cord to the placenta. Dissociated development of twin fetuses was more expressed in the premature multiple pregnancy.
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