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Blastocoel and blastoderm. The blastula (from Greek Î²Î»Î±ÏÏÏÏ (blastos), meaning sprout) is a hollow sphere of cells, referred to as blastomeres, surrounding an inner fluid-filled cavity called the blastocoele formed during an early stage of embryonic development in animals. blastula is a sphere of cells surrounding a blastocoele. The blastocoele is a fluid filled cavity which contains amino acids, proteins, growth factors, sugars, ions and other components which are necessary for cellular differentiation. The blastocoele also allows blastomeres to move during the process of gastrulation.
The trophoblast cells will play a key role in the process of implantation in the uterine wall and will eventually become the chorion, which is the embryonic portion of the placenta. In the next stage of vertebrate development, the embryo takes the form of a hollow ball called a blastula.In non-mammalian species, there is no inner cell mass. Instead, the blastula consists of just one cell layer.he first division occurs about a day after fertilization, and subsequent divisions occur every 12 to 24 hours after that. The zygote divides several times to form a mass of cells called a morula, which is an embryonic stage consisting of a solid, compact mass of 16 or more cells.