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Definition of Blastosphere
1. Noun. 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 occurs.
Generic synonyms: Conceptus, Embryo, Fertilized Egg
Terms within: Blastocele, Blastocoel, Blastocoele, Cleavage Cavity, Segmentation Cavity, Trophoblast
Specialized synonyms: Blastocyst, Blastodermic Vessicle
Derivative terms: Blastospheric, Blastular
Definition of Blastosphere
1. n. The hollow globe or sphere formed by the arrangement of the blastomeres on the periphery of an impregnated ovum.
Definition of Blastosphere
1. Noun. A blastula ¹
¹ Source: wiktionary.com
Medical Definition of Blastosphere
1.
Lexicographical Neighbors of Blastosphere
Literary usage of Blastosphere
Below you will find example usage of this term as found in modern and/or classical literature:
1. Elementary Text-book of Zoology by Carl Claus, Adam Sedgwick (1884)
"Frequenti v in cases of equal segmentation the segments arrange themselves in
the form of a one-layered vesicle, the blastosphere, the central cavity of ..."
2. Cyclopædia of the Diseases of Children: Medical and Surgical by John Marie Keating (1889)
"On optical section this blastosphere is seen to be made up of an FIRST STAGES OF
... The blastosphere consists at this stage of one layer of cells, ..."
3. Quarterly Journal of Microscopical Science edited by Biologists Limited, The Company of. (1880)
"slight as to be almost imperceptible, as in the Holothurian blastosphere, or it
may be more obvious as in that of the Sponge and ..."
4. A Treatise on Comparative Embryology by Francis Maitland Balfour (1885)
"These two cells soon pass into the cavity of the blastosphere, while at the same
time the area of granular cells becomes flattened out, and then becomes ..."
5. Outlines of zoology by John Arthur Thomson (1895)
"The segmentation cavity of the blastosphere is thus filled up, and the two layers
become differentiated from one another. ..."
6. The Biological Problem of To-day: Preformation Or Epigenesis? The Basis of a by Oscar Hertwig, Peter Chalmers Mitchell (1896)
"Plainly, the blastosphere cannot be pre-existing as a structure of particles in
the fertilised nucleus ; there cannot be blastosphere determinants. ..."
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