blastula

American  

[blas-chuh-luh] / ˈblæs tʃə lə /

noun

Embryology.

plural

blastulas, blastulae

1. the early developmental stage of an animal, following the morula stage and consisting of a single, spherical layer of cells enclosing a hollow, central cavity.

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blastula British  

/ ˈblæstjʊlə /

noun

1. Also called: blastosphere.  an early form of an animal embryo that develops from a morula, consisting of a sphere of cells with a central cavity

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blastula Scientific  

/ blăs′chə-lə /

plural

blastulas

1. 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.

2. Compare gastrula See also blastocyst

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blastula Cultural  

1. The stage of an embryo that consists of just over a hundred cells — a stage reached about one week after fertilization. At this stage the cells are just at the very beginning of cellular differentiation and are said to be totipotent (See totipotency).

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Discover More

This is the stage of development where embryonic stems cells can be harvested for medical research.

Other Word Forms

• blastular adjective
• blastulation noun

Etymology

Origin of blastula

1885–90; < New Latin < Greek blast ( ós ) bud, sprout + New Latin -ula -ule

Compare meaning

How does blastula compare to similar and commonly confused words? Explore the most common comparisons:

• morula vs. blastula
• blastula vs. blastocyst
• blastula vs. gastrula

Example Sentences

The blastula is often a hollow ball of cells.

From Textbooks • Jun. 9, 2022

Here the cells in the blastula arrange themselves in two layers: the inner cell mass, and an outer layer called the trophoblast.

From Textbooks • Jun. 9, 2022

Background: A prepared microscope slide of blastula cross-sections will show cells arrested in various stages of the cell cycle.

From Textbooks • Jun. 9, 2022

Cells in the growing tip of the root rapidly undergo mitosis, just as the whitefish blastula described in Figure 10.10.

From Textbooks • Jun. 9, 2022

Thus the gastrulation of the placentals, which diverges most from that of the amphioxus, the primitive form, is reduced to the original type, the invagination of a modified blastula.

From The Evolution of Man — Volume 1 by Haeckel, Ernst Heinrich Philipp August