Human Embryo Genesis

We can use the visual embryo site to quickly sketch out the structure of the embryogenesis process for humans. In other words, we can surmise the distinct processes by noting what and when different tissues/organs begin to develop. The initial phases are:

At this point the basic architecture of the embryo is in place, after about nine weeks from fertilization, the embryo is only 23-26 mm long, that is about one inch! For our purpose this is the most interesting portion of the 42 weeks gestation since it covers most of the important cell differentiation processes.

Copyright Ugo O. Gagliardi 2009