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gastrula    
n. 胚囊,肠胚

胚囊,肠胚

gastrula
n 1: double-walled stage of the embryo resulting from
invagination of the blastula; the outer layer of cells is
the ectoderm and the inner layer differentiates into the
mesoderm and endoderm

Gastrula \Gas"tru*la\, n.; pl. {Gastrul[ae]}[NL., dim. fr. Gr. ?
the stomach.] (Biol.)
An embryonic form having its origin in the invagination or
pushing in of the wall of the planula or blastula (the
blastosphere) on one side, thus giving rise to a
double-walled sac, with one opening or mouth (the blastopore)
which leads into the cavity (the archenteron) lined by the
inner wall (the hypoblast). See Illust. under {Invagination}.
In a more general sense, an ideal stage in embryonic
development. See {Gastr[ae]a}. -- a. Of or pertaining to a
gastrula.
[1913 Webster]


Planula \Plan"u*la\, n.; pl. {Planul[ae]}. [L., a little plane.]
1. (Biol.) In embryonic development, a vesicle filled with
fluid, formed from the morula by the divergence of its
cells in such a manner as to give rise to a central space,
around which the cells arrange themselves as an envelope;
an embryonic form intermediate between the morula and
gastrula. Sometimes used as synonymous with {gastrula}.
[1913 Webster]

2. (Zool.) The very young, free-swimming larva of the
c[oe]lenterates. It usually has a flattened oval or oblong
form, and is entirely covered with cilia.
[1913 Webster]


Stomapoda \Sto*map"o*da\, n. pl. [NL. See {Stoma}, and {-poda}.]
(Zool.)
An order of Crustacea including the squillas. The maxillipeds
are leglike in form, and the large claws are comblike. They
have a large and elongated abdomen, which contains a part of
the stomach and heart; the abdominal appendages are large,
and bear the gills. Called also {Gastrula}, {Stomatopoda},
and {Squilloidea}.
[1913 Webster]


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  • Gastrulation - Wikipedia
    Gastrulation is the stage in the early embryonic development of most animals, during which the blastula (a single-layered hollow sphere of cells), or in mammals, the blastocyst, is reorganized into a two-layered or three-layered embryo known as the gastrula [1]
  • Gastrula | Embryology, Cell Differentiation Morphogenesis . . .
    gastrula, early multicellular embryo, composed of two or more germinal layers of cells from which the various organs later derive The gastrula develops from the hollow, single-layered ball of cells called a blastula which itself is the product of the repeated cell division, or cleavage, of a fertilized egg This cleavage is followed by a
  • Gastrulation - Definition and Types - Biology Dictionary
    Gastrulation is the process during embryonic development that changes the embryo from a blastula with a single layer of cells to a gastrula containing multiple layers of cells Gastrulation typically involves the blastula folding in upon itself or dividing, which creates two layers of cells
  • 43. 5B: Cleavage, the Blastula Stage, and Gastrulation
    After the cleavage has produced over 100 cells, the embryo is called a blastula The blastula is usually a spherical layer of cells (the blastoderm) surrounding a fluid-filled or yolk-filled cavity (the blastocoel)
  • Embryology - Cellular Division - Gastrulation - TeachMeAnatomy
    Gastrulation is a process of cellular rearrangement which involves migration, invagination and differentiation of the epiblast It is largely controlled and orchestrated by the primitive streak The primitive streak is a groove in the midline of the epiblast which appears during the third week
  • Embryology, Gastrulation - StatPearls - NCBI Bookshelf
    Gastrulation is an early developmental process in which an embryo transforms from a one-dimensional layer of epithelial cells, a blastula, and reorganizes into a multilayered and multidimensional structure called the gastrula
  • GASTRULA Definition Meaning - Merriam-Webster
    The meaning of GASTRULA is an early metazoan embryo in which the ectoderm, mesoderm, and endoderm are established either by invagination of the blastula (as in fish and amphibians) to form a multilayered cellular cup with a blastopore opening into the archenteron or by differentiation of the blastodisc (as in reptiles, birds, and mammals) and





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