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(1) In botany, a squamous growth on the outer side of the embryo of many herbs. The epiblast covers the plumule partially or completely. It is well expressed in most bread grains and meadow grasses, for example, rice, Poa, barley, and bamboo. It is absent in millet, sorghum, corn, and canes. The epiblast protects the plumule. During germination it swells greatly, accumulating moisture like a sponge and participating in dehiscence of the caryopsis. The morphological nature of the epiblast is unclear.

(2) In zoology, the outer epithelial layer of the discoblastula, or blastoderm, in scorpions, cephalopods, mollusks, sharks, and bony fishes, as well as in most reptiles, birds, and lower mammals. The epiblast contains ectodermal and mesodermal material. It is isolated from the cells of the internal layer, or hypoblast, by a cavity known as the blastocoel.

References in periodicals archive ?
Culturing the epiblast cells of the pig blastocyst.
Continuous cultures of macrophages derived from the 8-day epiblast of the pig.
embryo mesocotyl internode negligible, epiblast present, scutellar tail absent, embryonic leaf margins overlapping), a pattern typical of Oryzeae, not unknown in Pooideae, and unrecorded within the PACC clade.
The first is the ICM, which subsequently develops into the epiblast and hypoblast; the epiblast forms the fetus.
Pig epiblast stem cells depend on activin/nodal signaling for pluripotency and self-renewal.
This migration occurs along the anterior-posterior portions of the epiblast--a portion of the inner cell mass--and the concentration of migrating cells results in the visible "primitive streak," which, while having a polarity ("cephalic," or head, and "caudal," or tail), is at this point merely a transitory part of the epiblast.
26) Gilbert notes that only certain cells in the epiblast migrate through the primitive streak, ones marked with a sulfated form of glucuronic acid.
Multiple Agilent Microarray Genomic Platforms, Online Design Tool Used to Examine Mouse Epiblast Cells and Human Embryonic Stem Cells for Similarities, Differences
Talbot is the co-inventor of the Hepatocyte Cell Line Derived from the Epiblast of Pig Blastocysts, U.
As blastocyst development proceeds, the POU transcription factor, OCT4 (Pou5f1), becomes progressively restricted, first to the entire inner cell mass (ICM) and then to the epiblast (Palmieri et al.