Blastocyst

A post-MORULA preimplantation mammalian embryo that develops from a 32-cell stage into a fluid-filled hollow ball of over a hundred cells. A blastocyst has two distinctive tissues. The outer layer of trophoblasts gives rise to extra-embryonic tissues. The inner cell mass gives rise to the embryonic disc and eventual embryo proper.

Year introduced: 1974

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Tree Number(s): A16.254.500

MeSH Unique ID: D001755

Entry Terms:

• Blastocysts
• Embryo, Preimplantation
• Embryos, Preimplantation
• Preimplantation Embryo
• Preimplantation Embryos

All MeSH Categories
Anatomy Category
Embryonic Structures
Embryo, Mammalian
Blastocyst
Blastocyst Inner Cell Mass
Trophoblasts
Extravillous Trophoblasts