trophoblast

(redirected from chorionic ectoderm)
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tro·pho·blast

 (trō′fə-blăst′)
n.
The outermost layer of cells of the mammalian blastocyst that attaches the fertilized ovum to the uterine wall and serves as a nutritive pathway for the embryo.

tro′pho·blas′tic adj.

trophoblast

(ˈtrɒfəˌblæst)
n
(Biology) the outer layer of cells of the embryo of placental mammals, which is attached to the uterus wall and absorbs nourishment from the uterine fluids
[C19: from tropho- + -blast]
ˌtrophoˈblastic adj

troph•o•blast

(ˈtrɒf əˌblæst, ˈtroʊ fə-)

n.
the layer of extraembryonic ectoderm that nourishes the embryo or develops into fetal membranes with nutritive functions.
[1885–90]
troph`o•blas′tic, adj.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.trophoblast - the membrane that forms the wall of the blastocyst in early development; aids implantation in the uterine wall; "after implantation of the blastocyst in the uterine wall the trophoblast divides into two layers, the chorion and the placenta"
blastosphere, blastula - early stage of an embryo produced by cleavage of an ovum; a liquid-filled sphere whose wall is composed of a single layer of cells; during this stage (about eight days after fertilization) implantation in the wall of the uterus occurs
tissue layer, membrane - a pliable sheet of tissue that covers or lines or connects the organs or cells of animals or plants
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