the outer covering of cells of the blastocyst
a layer of nutritive ectoderm outside the blastoderm, by which the fertilized ovum is attached to the uterine wall and the developing embryo receives its nourishment.
The layer of tissue that forms the wall of the blastocyst in the early stages of embryonic development. The trophoblast helps to implant the blastocyst to the uterine wall and supplies nutrients to the embryo. During implantation, the trophoblast differentiates into two layers. The inner layer, the cytotrophoblast forms into the chorion. The outer layer, syncytiotrophoblast, develops into the outer layer of the placenta. The trophoblast is also known as the trophectoderm.
the outer layer of cells which grow at the blastocyst stage as the fertilized ovum develops. It becomes part of the placenta.
the outer layer of the blastocyst that supplies nutrition to the embryo and facilitates implantation.
a layer of cells that forms after fertilization; projections from the trophoblast form vessels, which merge with maternal blood vessels to form the placenta.
trophe = nourishment + blastos = germ; outermost layer of chorion in a growing conceptus; with two sublayers (cytotrophoblast and syncytiotrophoblast).
The superficial layer of the blastocyst that will be involved in implantation, hormone production, and placenta formation.
As the cells of the early embryo specialise, they soon differentiate into: (1) central ones that will form the embryo or fetus itself; and (2) peripheral ones (the trophoblast) that will be responsible for invading the mother's tissues (see implantation) and will form the placenta and the membranes. See also: cytotrophoblast See also: syncytiotrophoblast See also: extravillous trophoblast
The outer layer of the blastoderm that will eventually establish the nutrient relationship with the uterine endometrium.
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"
The epithelium of the chorion, including the covering of the placental villi. It comprises a cellular layer (cytotrophoblast) and syncytium (synctiotrophoblast).
These are the cells of the embryo that become the placenta and attach the baby to the mother's uterus. These cells provide an armor of protection completely around the baby in the uterus. They also serve to nourish the baby carrying food from the mother's blood to the babies blood. These are the cells that are biopsied during a chorionic villus biopsy (CVS) to determine if the baby is genetically normal.
Gives rise to placenta and yolksac of the developing embryo
TRO-fo-blast A layer of cells in the preembryo that develops into the chorion and then the placenta. 218
the hollow outer layer of a blastocyst
The outer layer of cells of a blastocyst that adhere to the endometrium during implantation.
the layer of cells covering the embryo that develops into the placenta.
A granular protoplasmic body; a plastid, formed from cytotrophoblast, eventually surrounds the entire embryo; insert themselves between uterine epithelial cells, then spread along the epithilial surface of the basal lamina that underlies the endometrial epithelium to form a trophoplate.
This is the outer layer of the blastocyst. If the blastocyst were to be put into a uterus, this outside layer would help the embryo attach to the uterus and, if successful, would become the placenta.
placental epithelial cells, can be either nonvillous (interstitial or endovascular) or villous
The extraembryonic tissue responsible for implantation, developing into the placenta, and controlling the exchange of oxygen and metabolites between mother and embryo.
The leading cells of the implanting embryo that produce hCG and are destined to become the placenta.
Gr. trophos - one who feeds; Gr. blastos - germ, bud, shoot]. The outer layer of the conceptus which makes direct contact with endometrium. It develops into the fetal portion of placenta and is made up of two layers: the cytotrophoblast - the inner layer, and the syncytiotrophoblast - the outer layer.
The extraembryonic tissue arising from the outer layer of the blastocyst, involved in implantation and later in development of the placenta and chorion.
Outer layer on the blastocyst
Component of blastocyst that develops into placenta after implantation in the uterine wall.
Trophoblasts (from Greek threphein: to feed) are cells forming the outer layer of a blastocyst which provide nutrients to the embryo and develop into a large part of the placenta. They are formed during the first stage of pregnancy and are the first cells to differentiate from the fertilized egg.