blastocyst /blas·to·cyst/ (-sist) the mammalian conceptus in the postmorula stage, consisting of an embryoblast (inner cell mass) and a thin trophoblast layer enclosing a blastocyst cavity.
Blastocyst
blastocyst
blas·to·cyst (bl s t -s st )n. The modified blastula stage of mammalian embryos, consisting of the inner cell mass and a thin trophoblast layer enclosing the blastocoel. Also called blastodermic vesicle. blas to·cystic adj. |
Blastocyst
A cluster of cells representing multiple cell divisions that have occurred in the fallopian tube after successful fertilization of an ovum by a sperm. This is the developmental form which must leave the fallopian tube, enter the uterus, and implant itself in the uterus to achieve actual pregnancy.
Mentioned in: Infertility
blastocyst
[blas′təsist]
Etymology: Gk, blastos + kystis, bag
the embryonic form that follows the morula in human development. Implantation in the wall of the uterus usually occurs during this stage, approximately 8 to 13 days after fertilization. The blastocyst consists of an outer layer (trophoblast) which is attached to the inner cell mast.
blastocyst
the mammalian conceptus in the post-morula stage, consisting of the trophoblast, an inner cell mass, and a central, fluid-filled cavity.
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