Definitions for: Invagination


[n] the folding in of an outer layer so as to form a pocket in the surface
[n] the condition of being folded inward or sheathed



Webster (1913) Definition: In*vag`i*na"tion, 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.

Note: 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.

Synonyms: infolding, introversion, introversion, intussusception

See Also: biological process, condition, organic process

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