Inner cell mass

Inner cell mass
Blastocyst with an inner cell mass and trophoblast
Details
Carnegie stage	3
Days	6
Precursor	Blastocyst
Gives rise to	Epiblast, hypoblast
Identifiers
Latin	embryoblastus; massa cellularis interna; pluriblastus senior
MeSH	D053624
TE	cell mass_by_E6.0.1.1.2.0.4 E6.0.1.1.2.0.4
FMA	86557
Anatomical terminology [edit on Wikidata]

The inner cell mass (ICM) or embryoblast (known as the pluriblast in marsupials) is a structure in the early development of an embryo. It is the mass of cells inside the blastocyst that will eventually give rise to the definitive structures of the fetus. The inner cell mass forms in the earliest stages of embryonic development, before implantation into the endometrium of the uterus.^[1] The ICM is entirely surrounded by the single layer of trophoblast cells of the trophectoderm.