Embryonic Structure
epiblast Audio
ep·i·blast [ ep-uh-blast ]
Definitions related to epiblast:
  • The external or dorsal epithelial layer of the bilaminar blastoderm, derived from the inner cell mass of the embryoblast during the second week of gestation.
    NCI
    U.S. National Cancer Institute, 2021
  • The outer germ layer of a BLASTOCYST or BLASTULA, precursor of ectoderm and mesoderm.
    NLM Medical Subject Headings
    U.S. National Library of Medicine, 2025
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