Structure. The trophoblast proliferates and differentiates into 2 cell layers at approximately 6 days after fertilization for humans:
trophoblast [trof´o-blast] the peripheral cells of the blastocyst, which attach the zygote (fertilized ovum) to the uterine wall and become the placenta and the ...
noun, Embryology. 1. the layer of extraembryonic ectoderm that chiefly nourishes the embryo or develops into fetal membranes with nutritive functions.
The enveloping layer is now referred to as the trophoblast. It does not contribute directly to the formation of the embryo but rather serves to establish a connection ...
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A trophoblast is a layer of cells comprising the outer shell of a blastocyst, a cellular cluster that will eventually develop into an embryo.
Gestational trophoblastic disease (GTD) is a group of rare tumors that involve abnormal growth of cells inside a woman's uterus. Learn more here.
trophoblast [′träf·ə‚blast] (embryology) A layer of ectodermal epithelium covering the outer surface of the chorion and chorionic villi of many mammals.
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 ...
In 1902 Dr John Beard of the University of Edinburgh in Scotland proposed a cancer theory that has been given the following names: Trophoblast Theory of Cancer