kumardurgesh1802 6th Mar, 2025

Hello there,

Blastula: It is an early stage of embryonic development in animals, formed after cleavage of the zygote. It is a hollow ball of cells filled with fluid, with a single-layered structure. Found in non-mammalian organisms like frogs and fish.

Blastocyst: It is a specialized blastula in mammals, containing an inner cell mass (ICM) that later forms the embryo. It has an outer layer called the trophoblast, which helps in implantation in the uterus.

In short, blastula is the general term, while blastocyst is specific to mammals.

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Prachi Kumari 6th Mar, 2025

Hello,

Blastula and blastocyst are early stages of embryo development.

• Blastula : It is a hollow, spherical structure formed in early embryonic development in animals. It consists of a single layer of cells (blastoderm) surrounding a fluid-filled cavity (blastocoel). This stage comes after the morula stage.

• Blastocyst : It is a specialized form of the blastula found in mammals. It has an outer layer of cells (trophoblast) that later forms the placenta and an inner cell mass (ICM) that develops into the embryo. The blastocyst implants in the uterus.

In short, a blastula is a general term for early embryos, while a blastocyst is a specific term used for mammals.

Hope it helps !