[Formation of cerebral cortex relief in newborns with extremely low birth weight in the physiologic pregnancy and premature birth].

The course of cortical gyrification of the brain hemispheres in foetuses and newborns with an extremely low body weight in physiological pregnancy and premature birth. Topographical formation of the hemisphere cortex is completed by the 28th week of the intrauterine life. There exists a direct correlation between the period of the pregnancy and a certain spectrum of gyri. Two-three weeks retardation in the gyri and cortex relief formation in premature birth is observed. The results obtained can be used as additional criterion for determination of the gestational periods in foetuses and diagnosis of the disturbances in the brain formation in foetuses and newborns.