Lexic.us

Definition of Blastula

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.

Definition of Blastula

1. n. That stage in the development of the ovum in which the outer cells of the morula become more defined and form the blastoderm.

Definition of Blastula

1. Noun. (embryology) An early form in the development of an embryo, consisting of a spherical layer of cells filled with fluid; a blastosphere. ¹

¹ Source: wiktionary.com

Definition of Blastula

1. an early embryo [n BLASTULAS or -LAE]

Medical Definition of Blastula

1. Stage of embryonic development of animals near the end of cleavage but before gastrulation. In animals where cleavage (cell division) involves the whole egg, the blastula usually consists of a hollow ball of cells. This entry appears with permission from the Dictionary of Cell and Molecular Biology (11 Mar 2008)

Lexicographical Neighbors of Blastula

Literary usage of Blastula

Below you will find example usage of this term as found in modern and/or classical literature:

1. Text-book of the Embryology of Invertebrates by Eugen Korschelt, Karl Heider, Edward Laurens Mark, William McMichael Woodworth, Matilda Bernard, Martin Fountain Woodward (1895)
"The thickened part of the spherical blastula consists of tall cells, the entoderm; there is prominent among these a particularly large cell, which, ..."

2. Studies from the Morphological Laboratory in the University of Cambridge by University of Cambridge Morphological laboratory, Adam Sedgwick, Francis Maitland Balfour (1889)
"But granting the hollow blastula as a possible animal, ... It seems to me much more likely, if the ancestral Protozoon was a hollow blastula, that the first ..."

3. A Text-book of Zoology by Thomas Jeffery Parker, William Aitcheson Haswell (1921)
"The Cetacea are cosmopolitan the morula and blastula in a Mono- . . , , Theria. B, transition stage between m their distribution '. the great treme. ..."

4. A Textbook of General Embryology by William Erskine Kellicott (1913)
"CHAPTER VIII THE blastula, GASTRULA, AND GERM LAYERS MORPHOGENETIC PROCESSES IN this ... This will carry us from the formation of the blastula, through the ..."

5. Text-book of the Embryology of Invertebrates by Eugen Korschelt, Karl Heider, Edward Laurens Mark, William McMichael Woodworth, Matilda Bernard, Martin Fountain Woodward (1895)
"The thickened part of the spherical blastula consists of tall cells, the entoderm; there is prominent among these a particularly large cell, which, ..."

6. Studies from the Morphological Laboratory in the University of Cambridge by University of Cambridge Morphological laboratory, Adam Sedgwick, Francis Maitland Balfour (1889)
"But granting the hollow blastula as a possible animal, ... It seems to me much more likely, if the ancestral Protozoon was a hollow blastula, that the first ..."

7. A Text-book of Zoology by Thomas Jeffery Parker, William Aitcheson Haswell (1921)
"The Cetacea are cosmopolitan the morula and blastula in a Mono- . . , , Theria. B, transition stage between m their distribution '. the great treme. ..."

8. A Textbook of General Embryology by William Erskine Kellicott (1913)
"CHAPTER VIII THE blastula, GASTRULA, AND GERM LAYERS MORPHOGENETIC PROCESSES IN this ... This will carry us from the formation of the blastula, through the ..."

Other Resources: