Blastula definition

blăschə-lə
blastulae blastulas
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An early embryonic form produced by cleavage of a fertilized ovum and consisting of a spherical layer of cells surrounding a fluid-filled cavity.
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An early embryonic form produced by cleavage of a fertilized ovum and consisting of a spherical layer of cells surrounding a fluid-filled cavity.
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An embryo at the stage of development in which it consists of usually one layer of cells around a central cavity, forming a hollow sphere.
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An animal embryo at the stage immediately following the division of the fertilized egg cell, consisting of a ball-shaped layer of cells around a fluid-filled cavity known as a blastocoel.
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(embryology) An early form in the development of an embryo, consisting of a spherical layer of cells filled with fluid; a blastosphere.
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Alternative Forms

Alternative Form of blastula - blastule

Other Word Forms

Noun

Singular:
blastula
Plural:
blastulae, blastulas

Origin of blastula

  • New Latin from Greek blastos bud Latin -ula feminine diminutive suff.

    From American Heritage Dictionary of the English Language, 5th Edition

  • From New Latin, diminutive of Ancient Greek βλαστός (blastos, “a germ, bud, sprout, shoot”), from βλαστάνειν (blastanein, “to bud, sprout, grow, properly of plants, but also of animals”).

    From Wiktionary

Blastula Sentence Examples

  • Then follows the phenomenon of gastrulation, by which onehalf of the blastula is invaginated into the other, so as to obliterate the segmentation cavity.

  • The result of cleavage in all cases is a typical blastula, which when set free becomes oval and develops a flagellum to each cell, but when not set free, it remains spherical in form and has no flagella.

  • When the blastula is oval and freeswimming the inner mass is formed by unipolar immigration from the hinder pole.

  • Thus a planula larva may be a blastula, or but slightly advanced beyond this stage, or it may be (and most usually is) a parenchymula; or in some cases (Scyphomedusae) it may be a gastrula.

  • When the blastula is spherical and not set free, the germ-layer formation is always multipolar, either by immigration or by delamination, i.e.

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Words near blastula in the Dictionary