This is the second period of prenatal development., and it extends to the end of week eight.
Certain physiologic processes or spatial and temporal events called patterning occur during this period, which are considered key to further development.
These physiologic processes include induction, proliferation, differentiation, morphogenesis, and maturation.
These processes cause the structure of the implanted blastocyst to become, with further development, an embryo.
These physiologic processes also allow the teeth and associated orofacial structures, as well as other organ structures, to develop in the embryo.