endoderm

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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 hydrophobic barrier that seals the extracellular apoplastic space between neighboring endodermal cells is called the Casparian strip (shown in red).
Notochord repression of endodermal Sonic hedgehog permits pancreas development.
Common tumor markers associated with germ cell malignancies Benign Dysgerminoma Immature Endodermal teratoma teratoma sinus tumor AFP - - +/- ++ HCG - +/- - - LDH - ++ - +/- Estradiol - +/- +/- - PLAP * - ++ - - Embryonal Nongestational tumor choriocarcinoma AFP +/- - HCG ++ ++ LDH +/- +/- Estradiol +/- - PLAP * - - ++ Present +/- Occasionally present, reported - Not present at discriminatory levels or reported outside of case reports * placental alkaline phosphatase Source: Berek & Hacker's Gynecologic Oncology, Comprehensive Gynecology, Cancer Treat Rev.
First, it was a rare case of mixed germ cell tumors with components of Endodermal Sinus Tumor and embryonal carcinoma which is the least common (16%) component of germ cell tumors (5).
For the endodermal differentiation, hiPSCs were passaged and transferred into the cell culture plates without feeder cells.
The endodermal elements included glandular structures 45.
The rectum and bladder originate from the endodermal cloaca which is a single hollow tube.
Fatal Lyme carditis and endodermal heterotopia of the atrioventricular node.
Scholtz and Kamenz (2006) argue that several other arachnid characters such as trichobothria, slit-sense organs, endodermal malphigian tubules, and extra-intestinal digestion can be interpreted as apomorphic arachnid adaptations to land (Scholtz & Kamenz 2006).
Symptoms: headache, dizziness, nausea, diarrhea, blurriness, muscle cramps, hypotension, blood-stained urine, vomiting associated with mouth bleeding, bluishness, endodermal bleeding and sudden coma.