endoderm


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Related to endoderm: mesoderm

endoderm

(ĕn`dədûrm'), in biology, inner layer of tissue formed in the gastrula stage of the developing embryo. At the end of the blastula stage, cells of the embryo are arranged in the form of a hollow ball. Cell movement results in an invagination of the bottom region, or vegetal hemisphere, of the embryo so that it resembles a double-walled cup. The inner layer of the cup is the endoderm; the outer layer is the ectodermectoderm,
layer of cells that covers the surface of an animal embryo after the process of gastrulation has occurred. This outer layer, together with the endoderm, or inner layer, is present in all early embryos.
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; a middle layer, the mesodermmesoderm,
in biology, middle layer of tissue formed in the gastrula stage of the developing embryo. At the end of the blastula stage, cells of the embryo are arranged in the form of a hollow ball.
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, forms from a marginal zone. The endoderm is the germ layer from which are formed the digestive system, many glands, and part of the respiratory system. See embryoembryo
, name for the developing young of an animal or plant. In its widest definition, the embryo is the young from the moment of fertilization until it has become structurally complete and able to survive as a separate organism.
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Endoderm

 

(1) The internal layer of the embryo of multicellular animals in the gastrular stage (the internal germ layer). In the process of development, the endoderm forms the wall of the archenteron, which forms the mucosa of the entire intestine and the glands connected with the intestinal tract, including the liver and pancreas. In fishes, the endoderm forms the swim bladder and the internal gills, while in higher vertebrates it forms the lungs. In chordates, the endoderm and organs formed from it exert an inductive influence on the development of the chordamesoderm and on certain body parts formed from the ectoderm, including the mouth, anus, gill slits, and external gills. In turn, the endoderm and organs formed from it typically require interaction with materials originating from the ectoderm and mesoderm.

(2) The internal layer of the body wall in coelenterates.

endoderm

[′en·dō‚dərm]
(embryology)
The inner, primary germ layer of an animal embryo; sometimes referred to as the hypoblast. Also known as entoderm; hypoblast.
References in periodicals archive ?
The beginning of each treatment should be concerned with the balancing of the embryonic germinal tissue layers such as the ectoderm, mesoderm, and endoderm, speaking of the colon and internal organs.
Endoderm cells are characterized by stimulating signals and genetic regulatory factors.
Diverse serum and serum-free culture media for the induction of differentiation of stem cell-derived endoderm cells have been reported in previous studies (11, 12).
Disruption of NANOG in ESCs results in differentiation to endoderm lineages (Hamazaki et al.
Cells with continuous nuclear [beta]-catenin express Lhx3/4 (formerly called Lhx3) at the 32-cell stage, which is an essential factor for endoderm specification in the embryo of the closely related species Ciona savignyi.
The amniotic cavity develops from epiblast and three germ layers endoderm mesoderm and ectoderm are developed from hypoblst.
Eight (19%) of them in addition also showed tissues derived from endoderm.
VistaGen Therapeutics (otcqb:VSTA), a biotechnology company, has received a notice of allowance for US Patent Application 12/836,275, entitled 'Cell populations enriched for endoderm cells' from the US Patent and Trademark Office, it was reported yesterday.
To trace the process in detail, she and Thompson turned to genetically engineered mice that have labels distinguishing neural crest and endoderm tissues.
The histopathological examination revealed that the tumor included structures derived from all 3 germ cell layers: ectoderm, mesoderm, and endoderm (eg, cartilaginous, osseous, hematopoietic, fibrous, nervous, glandular, squamous epithelial, and smooth muscle tissues).
The anterior two thirds is derived from ectoderm and posterior one third is from endoderm.
Neurenteric cysts are uncommonly reported congenital abnormalities that are thought to be an abnormal connection between the endoderm and ectoderm during the 3rd week of life.