The outer layer of this double-walled sac is called the epiblast.
"Text Book of Biology, Part 1: Vertebrata" by H. G. Wells
Ectoblast: the outer wall of a cell; the ectoderm or epiblast.
"Explanation of Terms Used in Entomology" by John. B. Smith
Now the lens is an epiblastic structure, and the iris is mesoblastic.
"Science and Morals and Other Essays" by Bertram Coghill Alan Windle
Teeth-enamel is formed from the epiblast, and dentine, cementum, pulp (except as to nerve tissue) from the mesoblast.
"Degeneracy" by Eugene S. Talbot
Ectoderm, the tissue in an adult derived from the epiblast (which see), 19.
"The Biological Problem of To-day" by Oscar Hertwig
The cells of the epiblast, up to the thirteenth hour, have chiefly undergone change in becoming smaller.
"The Works of Francis Maitland Balfour, Volume 1" by Francis Maitland Balfour