Studies on animals have shown thatspontaneously generated motility is a naturally occuring phenomenon in embryos and fetuses and that the development of motor activity reflects the prenatal development of the nervous system. It was very difficult to cary out similar studies in humans for a long time because direct observation of fetal motility could only take place after a termination of the pregnancy or with the use of techniques for intrauterine observation wich endangered the fetus. Now that ultrasound technology has achieved a high degree of safety and perfection it is possible to accurately study humans feta lmotor development. ...
Zie: Summary
