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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 | Britannica
    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
  • 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
  • Gastrulation- Definition, Process, Factors, Consequences
    During gastrulation, the bilaminar embryonic disc is converted into a trilaminar embryonic disc Extensive cell shape changes, rearrangement, movement, and alterations in adhesive properties contribute to the process of gastrulation The embryo during this stage is called a gastrula
  • Gastrulation - Embryology
    The term gastrulation means the formation of gut (Greek, gastrula = belly), but has now a more broad sense to to describe the formation of the trilaminar embryo
  • Blastulation - Wikipedia
    Blastulation is the stage in early animal embryonic development that produces the blastula In mammalian development, a blastula develops into the blastocyst with a differentiated inner cell mass and an outer trophectoderm
  • Gastrula - an overview | ScienceDirect Topics
    In his gastraea theory, Ernst Haeckel (1874) imagined a gastrula that was like a planula larva on a biofilm, where an intrusion is created that produces a restricted, nutritive, and relatively stable environment
  • Gastrulation Process and Germ Layer Formation - Vedantu
    We will understand the structure of the gastrula and the process of gastrulation briefly Primary germ layers are formed in the process of gastrulation by the movement of cells in small masses or sheets
  • Animal Development II: Gastrulation Organogenesis
    Gastrulation results in three important outcomes: The formation of the embryonic tissues, called germ layers In organisms with three germ layers (triploblasts), the layers include the endoderm, ectoderm, and mesoderm (organisms with two germ layers – diploblasts – lack the mesoderm)
  • Gastrula - an overview | ScienceDirect Topics
    Gastrula is defined as the embryonic structure formed during gastrulation, characterized by multiple layers of cells that consist of the three germ layers: ectoderm, mesoderm, and endoderm





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