blastula, hollow sphere of cells, or blastomeres, produced during the development of an embryo by repeated cleavage of a fertilized egg. The cells of the blastula form an epithelial (covering) layer, called the blastoderm, enclosing a fluid-filled cavity, the blastocoel.

Blastulation is the stage in early animal embryonic development that produces the blastula. In mammalian development, the blastula develops into the blastocyst with a differentiated inner cell mass and an outer trophectoderm.

In this exploration, we delve into the various types of blastulae found across different taxa, elucidating their evolutionary significance and developmental variations.

Regardless of their shape, all blastulae represent an association of presumptive organ forming areas. During blastulation, these major presumptive organ forming areas of the future embryonic body are segregated into definite parts of the blastoderm.

2023年3月31日 · What is a Blastula in Biology? The blastula is an early embryonic stage that occurs during the development of many animal species. It is characterized by a hollow, spherical structure, with a fluid-filled cavity called the blastocoel.

2024年11月23日 · After the cleavage has produced over 100 cells, the embryo is called a blastula. The blastula is usually a spherical layer of cells (the blastoderm) surrounding a fluid-filled or yolk-filled cavity (the blastocoel).

2024年2月25日 · Blastula is the stage in early animal embryonic development that produces the blastocyst, a differentiated inner cell mass and an outer trophectoderm. In mammals, the blastula forms the blastocyst, with the inner cell mass going on to form the embryo.

Different types of blastulae. The blastula (from βλαστος, the germ) follows early cleavages and precedes gastrulation [29] . Blastula can be classified into four general types, with a large diversity amongst each type.

When copulation or coitus takes place, the semen is secreted or released by the penis into the vagina of the female. This process is known as insemination. The blastula is formed from the morula. The morula is an 8-16 celled structure and when this morula receives the nutrition it is then converted into a blastula.

the usually spherical body produced by cleavage of a fertilized ovum (zygote), consisting of a single layer of cells (blastoderm) surrounding a fluid-filled cavity (blastocoele); it follows the morula stage.