Blastocoel (Gr. Blastos - Embryo, Koi-Loma - Cavity)

The blastocoel (from the Greek words "blastos", which means "embryo" and "koi-loma", which translates as "cavity") is a cavity filled with fluid that is formed as a result of the crushing of a fertilized egg. The blastocoel is one of the first steps in the development of multicellular organisms.

When a sperm fertilizes an egg, a zygote is formed - the original cell of the future organism. The zygote begins to divide, a series of successive divisions occurs, resulting in the formation of a cell mass called a morula. Then the morula turns into a blastula, and a cavity is formed - the blastocoel.

The blastocoel is important in the development of the embryo. Inside the blastocoel, a blastodisc is formed - a cellular layer that will become the basis of future organs and tissues. The blastodisc consists of three layers - endoderm, ectoderm and mesoderm. The endoderm forms the internal organs, the ectoderm forms the skin and nervous system, and the mesoderm forms bones, muscles and the circulatory system.

Embryonic development begins at the blastocoel, and this occurs within the first few days after fertilization. Then the blastocoel turns into a gastrula, which already has a pronounced shape and layered structure.

In conclusion, we can say that the blastocoel is an important stage in the development of the embryo of multicellular organisms. It is from the blastodisc that all organs and tissues of the future organism are formed. Therefore, the study of the blastocoel is an important task in the field of biology and medicine.