Embryonic+Development+&+Stages

Embryonic development begins once the egg has been fertilized; it occurs at the fallopian tubes.
 You start off with the __**Zygote **__, or the fertilized egg, which splits to become an __**Embryo**__. That embryo will then turn into a __**Morula**__, due to the continuous splitting of the cells. A morula is basically an unorganized ball of cells. The next step will be blastulation. What blastulation does is make layers, and once it occurs you have what is called a __**Blastocyst**__- a hollow sphere of cells, and the wall of cells is organized. Now grastulation takes place and the result is a __**Grastula**__. Grastulation is when the blastocyst folds inwards, creating even more layers. Now each one of those layers will undergo differentiation. Once differentiation is complete you have a __**Neurula**__. Each layer will become a different structure which will have different tasks with the fetus later on.

Steps in order:
==Zygote  -> Embryo -> Morula -> Blastocyst -> Grastula -> Neurula ==

//Resources:// Human Sexual Reproduction (Part 5)