| 释义 |
trophoblast
tro·pho·blast T0378500 (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 adjtroph•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. Thesaurus| Noun | 1. | 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 occurstissue layer, membrane - a pliable sheet of tissue that covers or lines or connects the organs or cells of animals or plants |
TranslationsTrophoblast
trophoblast[′träf·ə‚blast] (embryology) A layer of ectodermal epithelium covering the outer surface of the chorion and chorionic villi of many mammals. Trophoblast the exterior layer of cells in the embryos of mammals. The trophoblast is isolated in the blastocyst stage and makes possible contact between the embryo and the mother’s system by allowing nutrients to pass from the mother to the embryo. The part of the trophoblast located above the embryonic shield is called Rauber’s layer. The trophoblast that is lined internally with mesenchymal cells is called the chorion. The trophoblast plays a role in the implantation of the embryo in the uterine wall and the formation of the placenta. trophoblast
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 membranes that nourish and protect the developing organism. The inner cellular layer is the cytotrophoblast and the outer layer is the syntrophoblast.troph·o·blast (trof'ō-blast, trō'fō-blast), The mesectodermal cell layer covering the blastocyst that erodes the uterine mucosa and through which the embryo receives nourishment from the mother; the cells do not enter into the formation of the embryo itself but contribute to formation of the placenta. The trophoblast develops processes that later receive a core of vascular mesoderm and are then known as the chorionic villi; the trophoblast soon becomes two layered, differentiating into the syncytiotrophoblast, an outer layer consisting of a multinucleated protoplasmic mass (syncytium), and the cytotrophoblast, the inner layer next to the mesoderm in which the cells retain their membranes. Synonym(s): chorionic ectoderm [tropho- + G. blastos, germ] trophoblast (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.troph·o·blast (trō'fō-blast) The mesectodermal cell layer covering the blastocyst, which erodes the uterine mucosa and through which the embryo receives nourishment from the mother; the cells do not enter into the formation of the embryo itself, but contribute to the formation of the placenta. The trophoblast develops processes that later receive a core of vascular mesoderm and are then known as the chorionic villi; the trophoblast soon becomes two-layered, differentiating into the syncytiotrophoblast, an outer layer consisting of a multinucleated protoplasmic mass (syncytium), and the cytotrophoblast, the inner layer next to the mesoderm in which the cells retain their membranes. [tropho- + G. blastos, germ]trophoblast The outer layer of the BLASTOCYST.trophoblast the outermost layer of cells surrounding the BLASTOCYST, consisting of embryonic epithelium, which subsequently encloses all the embryonic structures of the developing mammal and forms the outer layer of the CHORION and the embryonic side of the placenta.TrophoblastThe tissues that surround an embryo and attach it to the uterus.Mentioned in: Choriocarcinomatroph·o·blast (trō'fō-blast) Mesectodermal cell layer covering the blastocyst that erodes uterine mucosa and through which embryo receives nourishment from mother. [tropho- + G. blastos, germ]trophoblast
Related to trophoblast: chorion, placenta, cytotrophoblast, blastocyst cavityWords related to trophoblastnoun the membrane that forms the wall of the blastocyst in early developmentRelated Words- blastosphere
- blastula
- tissue layer
- membrane
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