There is thus formed a flattened sack, lined by epiblast, which may be called the primary optic vesicle.
Ectoblast: the outer wall of a cell; the ectoderm or epiblast.
Both of these strata eventually become the epiblast, of which they form the epidermic and nervous layers.
These have supposed that the mesoblast is derived from the epiblast.
In a the epiblast and hypoblast are continuous at the edge of the section, owing to the section passing through the embryonic rim.
The upper of these is the epiblast, and the lower the hypoblast.
Between the epiblast and hypoblast there is a layer of mesoblast, which does not extend as far as the two other layers.
The outer of these is the epiblast, the inner the mesoblast.
Teeth-enamel is formed from the epiblast, and dentine, cementum, pulp (except as to nerve tissue) from the mesoblast.
The division of the epiblast into a nervous and epidermic stratum.
epiblast ep·i·blast (ěp'ə-blāst')
The outer layer of a blastula that gives rise to the ectoderm after gastrulation.