[CDHart]

What is a blastocyst?

carolyn

[gridlock]

What is a blastocyst?

It is a certain stage in human development, kind of like a four-and-a-half year-old.

[Mrs. Don-o]

Zygote, morula, blastocyst, etc. are different stages of early human development, after the inception of life at fertilization.

A blastocyst is a pre-implanted embryo. At this point the embryo is shaped like a hollow ball, with an inner and an outer layer of cells which will continue to differentiate through the individual's lifespan --- however long a human lives.