gastrula

American  

[gas-troo-luh] / ˈgæs trʊ lə /

noun

Embryology.

• gastrulas,
  plural
• gastrulae
  plural

1. a metazoan embryo in an early state of germ layer formation following the blastula stage, consisting of a cuplike body of two layers of cells, the ectoderm and endoderm, enclosing a central cavity, or archenteron, that opens to the outside by the blastopore: in most animals progressing to the formation of a third cell layer, the mesoderm.

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gastrula British  

/ ˈɡæstrʊlə /

noun

1. a saclike animal embryo consisting of three layers of cells (ectoderm, mesoderm, and endoderm) surrounding a central cavity (archenteron) with a small opening (blastopore) to the exterior See also ectoderm mesoderm endoderm

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gastrula Scientific  

/ găs′trə-lə /

• gastrulas
  plural

1. An animal embryo at the stage following the blastula. The gastrula develops from the blastula by invagination (inpocketing), forming an inner cavity with an opening and causing the cells to be distributed into an outer layer (ectoderm) and an inner layer (endoderm). In complex animals such as vertebrates, a third layer (mesoderm) also forms. These layers later develop into the organs and tissues of the body. In vertebrates and other deuterostomes, the opening of the gastrula becomes the anus, while in protostomes (such as arthropods), it becomes the mouth.

2. ◆ The development of an embryo from blastula to gastrula is called gastrulation.

3. Compare blastula

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Other Word Forms

Derived Forms

• gastrular
  adjective
• pregastrular
  adjective

Inflected Forms

Nouns

• gastrulae
  plural
• gastrulas
  plural

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Etymology

Origin of gastrula

From New Latin, dating back to 1875–80; see origin at gastro-, -ule

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Compare meaning

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

• blastula vs. gastrula

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Example Sentences

See Examples For:

gastrula gastrulae

"But Haeckel's hypothetical gastrula was a particle-filtering life form, like sponges. In contrast, the predatory gastrula of Aiptasia and other cnidarians possess specialised stinging cells used for capturing prey."

From Science Daily ● Sep. 29, 2023

As Prof. Holstein underscores, the data obtained paint a new picture of the predatory lifestyle as a primary characteristic of the cnidarian gastrula.

From Science Daily ● Sep. 29, 2023

Thus, Briggs and King concluded5 that the nuclei of cells in the late-stage gastrula have an “intrinsic restriction in potentiality for differentiation”.

From Nature ● Oct. 13, 2019

In both protostomes and deuterostomes, the gastrula, which resembles a hollow ball of cells, contains an indentation called a blastopore.

From Textbooks ● Jan. 1, 2015

Take a boiled egg, make a hole in the smaller end and remove the yolk, and you have a passable model of a gastrula.

From The Whence and the Whither of Man A Brief History of His Origin and Development through Conformity to Environment; Being the Morse Lectures of 1895 by John Mason Tyler

For Ptychodera, extensive EST data from egg, blastulae, gastrulae, larvae, juveniles, adult proboscis, stomochord, and gills defining 34,159 cDNA clones53, and 879,000 Roche/454 RNAseq reads from a mixed library of developmental stages54 were used.

From Nature ● Nov. 17, 2015

The gastraea probably lived in the sea during the Laurentian period, swimming about in the water by means of its ciliary coat much as free ciliated gastrulae do to-day.

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

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