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invagination 凹入; 內陷; 反折; 折入; 套迭 凹入; 內陷; 反折; 折入; 套? invagination n 1: the condition of being folded inward or sheathed [ synonym: { invagination}, { introversion}] 2: the folding in of an outer layer so as to form a pocket in the surface; " the invagination of the blastula" [ synonym: { invagination}, { introversion}, { intussusception}, { infolding}] Invagination \ In* vag` i* na" tion\, n. [ L. pref. in- vagina sheath.] [ 1913 Webster] 1. ( Biol.) The condition of an invaginated organ or part. [ 1913 Webster] 2. The inward movement of the wall of a tissue or cell, to form a cavity; also, the cavity thus formed. [ PJC] 3. Specifically: ( Biol., Embryology) The inward movement of one part of the wall of a blastula, to form a gastrula; the process of gastrulation, in which layers of the ovum are differentiated. [ 1913 Webster PJC] 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. [ 1913 Webster]
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