Skip to Content


Pronunciation: em'bre-o-blast'

Definition: The mass of cells at the embryonic pole of the blastocyst that forms the embryo and some extraembryonic or adnexal tissues.

Synonym(s): inner cell mass

[embryo- + G. blastos, germ]

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review date: Sep 19, 2016.