extraembryonic ectoderm

extraembryonic ectoderm
a derivative of epiblast or ectoderm located outside the body of the embryo.

Medical dictionary. 2011.

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  • Ectoderm — One of the three primary germ cell layers (the other two being the mesoderm and endoderm) that make up the very early embryo. The ectoderm is the outermost of the three layers. It differentiates to give rise to many important tissues and… …   Medical dictionary

  • Germ line development — The cells that give rise to the gametes are often set aside during cleavage. During development, these cells will differientate into primordial germ cells, migrate to the location of the gonad, and form the germ line of the animal. Creation of… …   Wikipedia

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  • trophoblast — trophoblastic, adj. /trof euh blast , troh feuh /, n. Embryol. the layer of extraembryonic ectoderm that chiefly nourishes the embryo or develops into fetal membranes with nutritive functions. [1885 90; TROPHO + BLAST] * * * …   Universalium

  • trophoblast — troph•o•blast [[t]ˈtrɒf əˌblæst, ˈtroʊ fə [/t]] n. dvl the layer of extraembryonic ectoderm that nourishes the embryo or develops into fetal membranes with nutritive functions • Etymology: 1885–90 troph o•blas′tic, adj …   From formal English to slang

  • mesoderm — The middle of the three primary germ layers of the embryo (the others being ectoderm and endoderm); m. is the origin of connective tissues, myoblasts, blood, the cardiovascular and lymphatic systems, most of the urogenital system, and the …   Medical dictionary

  • Gastrulation — of a diploblast: The formation of germ layers from a (1) blastula to a (2) gastrula. Some of the ectoderm cells (orange) move inward forming the endoderm (red). Gastrulation is a phase early in the embryonic development of most animals, during… …   Wikipedia

  • Human embryogenesis — is the process of cell division and cellular differentiation of the human embryo during early prenatal development. It spans from the moment of fertilization to the end of the 8th week of gestational age, whereafter the embryo is called a fetus.… …   Wikipedia

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  • membrane — 1. A thin sheet or layer of pliable tissue, serving as a covering or envelope of a part, as the lining of a cavity, as a partition or septum, or to connect two structures. SYN: membrana [TA]. 2. SYN: biomembrane. [L. membrana, a skin or m …   Medical dictionary

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