blastoderm

American  

[blas-tuh-durm] / ˈblæs təˌdɜrm /

noun

Embryology.

1. the primitive layer of cells that results from the segmentation of the ovum.

2. the layer of cells forming the wall of the blastula, and in most vertebrates enclosing a cavity or a yolk mass.

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blastoderm British  

/ ˈblæstəʊˌdɜːm /

noun

1. the layer of cells that surrounds the blastocoel of a blastula

2. a flat disc of cells formed after cleavage in a heavily yolked egg, such as a bird's egg

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Other Word Forms

• blastodermatic
  adjective
• blastodermic
  adjective

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Etymology

Origin of blastoderm

First recorded in 1855–60; blasto- + -derm

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Example Sentences

See Examples For:

blastoderm

Such words as "blastoderm", "sindoc," "peris," "parasang," "sarcenet," "teazel," "nullah," "cantatrice," "barracan," "sistrum," writhed and hissed in her verses.

From Time Magazine Archive

This by successive divisions forms a group of four to eight cells, which subsequently pass through the blastoderm, and dividing into two groups become symmetrically arranged and surrounded by the rudiments of the ovarian tubes.

From Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 4 "Hero" to "Hindu Chronology" by Various

When the egg leaves the ovary the nucleus disappears, leaving behind it this rudiment of the blastoderm, which rapidly grows and increases in size.

From Form and Function A Contribution to the History of Animal Morphology by E. S. (Edward Stuart) Russell

We call this layer the blastoderm, and the sphere itself the blastula, or embryonic vesicle.

From The Evolution of Man — Volume 2 by Ernst Heinrich Philipp August Haeckel

Elsewhere in the blastoderm they are distinctly separate.

From Text Book of Biology, Part 1: Vertebrata by H. G. (Herbert George) Wells

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