definição e significado de Invagination | sensagent.com


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alemão búlgaro chinês croata dinamarquês eslovaco esloveno espanhol estoniano farsi finlandês francês grego hebraico hindi holandês húngaro indonésio inglês islandês italiano japonês korean letão língua árabe lituano malgaxe norueguês polonês português romeno russo sérvio sueco tailandês tcheco turco vietnamês

Definição e significado de Invagination

Definição

invagination (n.)

1.the folding in of an outer layer so as to form a pocket in the surface"the invagination of the blastula"

2.the condition of being folded inward or sheathed

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Merriam Webster

InvaginationIn*vag`i*na"tion (?), n. [L. pref. in- + vagina sheath.]


1. (Biol.) The condition of an invaginated organ or part.

2. The inward movement of the wall of a tissue or cell, to form a cavity; also, the cavity thus formed.

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.

☞ 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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invagination (n.)


Wikipedia

Invagination

                   

To invaginate means to fold inward or to sheath. In biology, this can refer to a number of processes.

  • Invagination is the morphogenetic processes by which an embryo takes form, and is the initial step of gastrulation, the massive reorganization of the embryo from a simple spherical ball of cells, the blastula, into a multi-layered organism, with differentiated germ layers: endoderm, mesoderm, and ectoderm. More localized invaginations also occur later in embryonic development,
  • The inner membrane of a mitochondrion invaginates to form cristae, thus providing a much greater surface area to accommodate the protein complexes and other participants that produce ATP.
  • Invagination occurs during endocytosis and exocytosis when a vesicle forms within the cell and the membrane closes around it.
  • Invagination of a part of the intestine into another part is called intussusception.

In the humanities:

  • Used to explain a special kind of metanarrative. Used by Rosalind Krauss and Jacques Derrida (The Law of Genre, Glyph 7 (1980).

In Geology:

  • Used to describe a deep depression of strata. Used by Donald L. Baars in "The Colorado Plateau"
   
               

 

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