Histology Embryology What's Embryology? Embryology is a kind of science ca study the processes and the regulations of the development of human fetus Preembryonic period Embryonic period 8 weeks before) -- Fetal period(9-38 weeks)What’s Embryology? Embryology is a kind of science which study the processes and the regulations of the development of human fetus. --- Preembryonic period --- Embryonic period (8 weeks before) --- Fetal period (9-38 weeks)