A blastocyst is a stage in mammalian embryonic development consisting of an inner cell mass, cavity, and outer layer (trophoblast), forming about a week after fertilization in humans.
blastocyst: La etapa de blástula del desarrollo embrionario en mamíferos, que consiste en una masa celular interna, una cavidad y una capa externa, el trofoblasto. En humanos, el blastocisto se forma una semana después de la fertilización.
| Front | blastocyst |
|---|---|
| Back | The blastula stage of mammalian embryonic development, consisting of an inner cell mass, a cavity, and an outer layer, the trophoblast. In humans, the blastocyst forms one week after fertilization. |
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