Any cellular process that results in the specification, formation or maintenance of polarized cytoskeletal structures that contribute to the cell polarity of a migrating ameboid cell taking part in gastrulation.

The actin-mediated process that results in the contraction of the apical end of a polarized columnar epithelial cell, contributing to the process of gastrulation.

A complex and coordinated series of cellular movements, including germ band extension, that occurs at the end of cleavage during embryonic development. An example of this process is found in Drosophila melanogaster.

Any process that modulates the rate or extent of gastrulation. Gastrulation is the complex and coordinated series of cellular movements that occurs at the end of cleavage during embryonic development of most animals.

Any process that modulates the surface configuration of an embryonic cell.

Any process that modulates the frequency, rate or extent of the assembly, arrangement of constituent parts, or disassembly of a bipolar filament composed of myosin II molecules.

The process whose specific outcome is the progression of the mesectoderm over time, from its formation to the mature structure. In animal embryos, mesectoderm development processes give rise to both mesoderm and ectoderm tissues.

The morphogenetic process in which an epithelium narrows along one axis and lengthens in a perpendicular axis usually resulting in the formation of the three primary germ layers, ectoderm, mesoderm and endoderm.

The actin filament-based process in which cytoplasmic actin filaments slide past one another resulting in contraction of all or part of the cell body.

Any of a family of heterotrimeric GTP-binding and hydrolyzing proteins; they belong to a superfamily of GTPases that includes monomeric proteins such as EF-Tu and RAS. Heterotrimeric G-proteins consist of three subunits; the alpha subunit contains the guanine nucleotide binding site and possesses GTPase activity; the beta and gamma subunits are tightly associated and function as a beta-gamma heterodimer; extrinsic plasma membrane proteins (cytoplasmic face) that function as a complex to transduce signals from G protein-coupled receptors to an effector protein.

The membrane surrounding a cell that separates the cell from its external environment. It consists of a phospholipid bilayer and associated proteins.