In embolic invagination, one half of the blastosphere is pushed in towards the other half, producing an embryonic form known as a gastrula. In epibolic invagination, a phenomenon in the development of some invertebrate ova, the epiblast appears to grow over or around the hypoblast.
Origin: L. Pref. In- + vagina sheath.
(01 Mar 1998)
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