Term Name: | bilaminar disc |
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Synonyms: | bilaminar disk, bilaminary embryonic disc, bilaminary germ disc, embryonic disc, embryonic shield, germinal disc, germinal disk |
Definition: | A flattened, almost circular bilaminar plate of cells formed when the inner cell mass (aka embryoblast) forms two epithelial layers, each of a distinct lineage, separated by an extracellular basement membrane: the external (dorsal) layer is called the epiblast and the internal (ventral) layer is called the hypoblast (aka primitive endoderm); together, they compose the bilaminar embryonic disc. |
Ontology: | Cell Ontology [UBERON:0000091] |