Invagination
invagination (?), n. (L. pref.in- + vagina sheath.)
1. (Biol.) The condition of an
invaginated organ or part.
2. (Biol.) One of the methods by which
the various germinal layers of the ovum are differentiated.
f 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.
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