ABSTRACT
Three-dimensional (3D) ultrasound has been available for more than 15 years. During its continuous improvement and development, several different kinds of modes have been created. Fetal behavior could be described as any fetal action or reaction observed by the mother or other more objective method, as actocardiotocography or ultrasonography. Development of the human central nervous system (CNS) begins in the early embryonic period and proceeds through a sequence of very complicated processes long after delivery. The earliest interneuronal connections, the synapses, can be detected in the spinal cord shortly before the onset of embryonic motility, at 6 to 7 weeks of gestation. The brain stem is fashioned around the 7th week of gestation, and basic structures of the diencephalon and cerebral hemispheres are formed by the end of the 8th gestational week. An alteration from the given pattern of motoric development should be considered as an indication for further investigation.
