invagination
凹入; 内陷; 反折; 折入; 套迭
凹入; 内陷; 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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