gastrula
Definition
Noun: 1. An early stage in the embryonic development of most animals: The gastrula is a structure that follows the blastula stage. It is characterized by the formation of two or three distinct layers of cells (germ layers) through a process called gastrulation. These layers will eventually give rise to all the tissues and organs of the body.
Examples of Usage
- Noun:
- During development, the single-layered blastula transforms into a multilayered gastrula.
- The formation of the gastrula is a critical step in establishing the body plan of the organism.
- Scientists study gene expression in the gastrula to understand how different cell types are specified.
Advanced Usage
- "gastrula stage": Refers specifically to the period of embryonic development when the embryo is in the gastrula form.
- Key signaling pathways are active during the gastrula stage.
Variants and Related Words
- Gastrulation (n): The process by which a blastula becomes a gastrula, involving cell movement and reorganization.
- Gastrulation is one of the most important phases in early development.
- Gastrulate (v): To undergo the process of gastrulation.
- The embryo will gastrulate approximately 24 hours after fertilization.
Synonyms
- Embryonic stage (specific to this phase)
- Germ-layer stage
Related Terms (Not synonyms, but part of the same conceptual framework)
- Blastula: The embryonic stage preceding the gastrula.
- Ectoderm: The outermost germ layer of the gastrula, which gives rise to the skin and nervous system.
- Mesoderm: The middle germ layer, which gives rise to muscles, bones, and the circulatory system.
- Endoderm: The innermost germ layer, which gives rise to the lining of the digestive and respiratory tracts.
Noun
-
double-walled stage of the embryo resulting from invagination of the blastula; the outer layer of cells is the ectoderm and the inner layer differentiates into the mesoderm and endoderm
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