What is the name of the developmental stage that occurs between zygote and foetus?

The developmental stage that occurs between the zygote and the fetus is called the embryo. After fertilization, the single-celled zygote undergoes several divisions, leading to the formation of a multicellular organism. This initial stage of development, referred to as the embryo, lasts until the completion of key developmental milestones, such as the formation of major organs and structures.

During the embryonic stage, significant processes take place, including cell differentiation and organogenesis, where cells begin to take on specialized functions and eventually form different parts of the body. This stage is crucial for establishing the basic body plan and the foundational structures necessary for the later stages of development.

The terms "blastocyst" and "gastrula" refer to specific phases within the early developmental timeline, but they are subsets of the broader embryonic stage. A blastocyst is formed after the embryo has undergone several divisions, characterized by a hollow ball of cells that will implant into the uterine wall. The gastrula stage follows the blastocyst stage and involves the formation of germ layers. The term "fetus" refers to the later stage of development that occurs after the embryonic phase, where structures are more defined and development continues toward birth. Thus, the appropriate