| 释义 |
blastosphere
blas·to·sphere B0316400 (blăs′tə-sfîr′)n. See blastula.blastosphere (ˈblæstəʊˌsfɪə) n1. (Biology) another name for blastula2. (Biology) another name for blastocyst1Thesaurus| Noun | 1. |  blastosphere - 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 occursblastulaconceptus, fertilized egg, embryo - an animal organism in the early stages of growth and differentiation that in higher forms merge into fetal stages but in lower forms terminate in commencement of larval lifeblastocele, blastocoel, blastocoele, cleavage cavity, segmentation cavity - the fluid-filled cavity inside a blastulablastocyst, blastodermic vessicle - the blastula of a placental mammal in which some differentiation of cells has occurredtrophoblast - 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" |
EncyclopediaSeeBlastulablastosphere
blastosphere (blăs′tə-sfîr′)n. See blastula.blastula A hollow sphere formed during the early embryonic development of higher animals—which follows the morular stage of embryogenesis—in which dividing cells line up on the outside and are bathed by fluid within the adjacent cavity (blastocoele). In animals where cleavage involves the whole egg, the blastula consists of a ball of cells with a hollow centre.blastosphere see BLASTULA.blastosphere
Related to blastosphere: blastopore, blastocyst, gastrulation, embryo, DeuterostomeSynonyms for blastospherenoun early stage of an embryo produced by cleavage of an ovumSynonymsRelated Words- conceptus
- fertilized egg
- embryo
- blastocele
- blastocoel
- blastocoele
- cleavage cavity
- segmentation cavity
- blastocyst
- blastodermic vessicle
- trophoblast
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