germ layer

American  

noun

1. one of the three primary embryonic cell layers.

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germ layer British  

noun

1. embryol any of the three layers of cells formed during gastrulation See ectoderm mesoderm endoderm

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germ layer Scientific  

1. Any of three cellular layers, the ectoderm, endoderm, or mesoderm, into which most animal embryos differentiate in the gastrula stage and from which the organs and tissues of the body develop through further differentiation.

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Etymology

Origin of germ layer

First recorded in 1875–80

Example Sentences

At this point gastrulation begins and the so-called germ layers form.

From Science Daily

It was assumed that cells could be converted only to other cell types from the same germ layer, owing to their closely related developmental origins.

From Nature

In gastrulation, the epiblast differentiates into the three germ layers of cells — the ectoderm, mesoderm and endoderm — that will form the fetus.

From Nature

Symmetry breaking, germ layer specification and axial organisation in aggregates of mouse embryonic stem cells.

From Nature

It would be more revealing, he adds, to track later developmental events, such as the formation of the three germ layers that give rise to different organs, because these events are less governed by luck.

From Nature