A blastocyst is a structure formed in the early development of mammals, including humans, consisting of an inner cell mass that will eventually develop into the embryo and an outer layer called the trophoblast that will form part of the placenta. This stage typically occurs about 5-6 days after fertilization and is crucial for implantation into the uterine wall, signaling the transition from a zygote to a more complex developmental stage.
congrats on reading the definition of blastocyst. now let's actually learn it.