Explain The Three Phases Of Early Embryonic

The three phases of early embryonic are: cleavage, gastrulation, and organogenesis. First, cleavage is the phase “in which a zygote is repeatedly divided into smaller individual cells through cell division” (Krogh, 2011, p. 619). During this phase the cells will become smaller because usual growth will not occur during cell division. As a result, a tightly packed ball of early embryonic cells called a morula will develop. After experiencing additional changes the cells will arrange themselves into a blastula. The blastula is a structure that has layers of cells surrounding it with a liquid filled cavity. Additionally, an egg containing quantity of yolk will help give the zygotes a polarity. The end of the zygote that contains the most amount of yolk is called …show more content…
The next phase of embryonic development is gastrulation, during this phase the development of the body will take place. Gastrulation “is a process in early development in which an embryo’s cells migrate to form three layers of tissue: the endoderm, the mesoderm, and the ectoderm” (Krogh, 2011, p. 620). The movement of cells during this phase will help to develop the embryo. After all movement have been completed the cells will configure themselves into the three different layers. Each of these layers will have an assign role in the inside, outside, and the middle of the process. The three layers will help to develop tissues and organs. Starting at the blastula’s vegetal pole, cells at pole will detach from the ring of blastula cells and move to the blastocoel. The movement of the cells will