Gastrulation is the stage in the early embryonic development of most animals, during which the blastula (a single-layered hollow sphere of cells), or in mammals the blastocyst, is reorganized into a two-layered or three-layered embryo known as the gastrula. [1]

2023年4月23日 · Gastrulation is an early developmental process in which an embryo transforms from a one-dimensional layer of epithelial cells, a blastula, and reorganizes into a multilayered and multidimensional structure called the gastrula.

gastrula, early multicellular embryo, composed of two or more germinal layers of cells from which the various organs later derive. The gastrula develops from the hollow, single-layered ball of cells called a blastula which itself is the product of the repeated cell division, or cleavage, of a fertilized egg. This cleavage is followed by a ...

2017年4月28日 · Gastrulation is the process during embryonic development that changes the embryo from a blastula with a single layer of cells to a gastrula containing multiple layers of cells. Gastrulation typically involves the blastula folding in upon itself or …

2021年2月9日 · Gastrulation is a process of cellular rearrangement which involves migration, invagination and differentiation of the epiblast. It is largely controlled and orchestrated by the primitive streak. The primitive streak is a groove in the midline of the epiblast which appears during the third week.

During gastrulation, the germ layers of an embryo are formed and the body plan of the mature organism is established. Movements on a massive scale allow cells to establish great complexity from a very simple starting form.

The term gastrulation means the formation of gut (Greek, gastrula = belly), but has now a more broad sense to to describe the formation of the trilaminar embryo. The epiblast layer, consisting of totipotential cells, derives all 3 embryo layers: ectoderm, mesoderm and endoderm.

Gastrulation is a nicely integrated, dynamic process which is controlled largely by intrinsic forces bound up in the specific physico-chemical conditions of the various presumptive organ forming areas of the late blastula and early gastrula.

2023年4月23日 · Gastrulation is an early developmental process in which an embryo transforms from a one-dimensional layer of epithelial cells, a blastula, and reorganizes into a multilayered and multidimensional structure called the gastrula.

Gastrulation occurs after fertilization and marks the transition from a blastula to a gastrula, typically around the third week of human embryonic development. The process involves significant cellular movements, including invagination, involution, and epiboly, which help form the three germ layers.