Only when the blastocoel is formed does the early embryo become a blastula.

A blastula is a sphere of cells surrounding a blastocoel.

The blastocoel also allows blastomeres to move during the process of gastrulation.

This buckles inwards towards the blastocoel in a process called invagination.

A seal is created by tight junctions of the epithelial cells which line the blastocoel.

The blastula stage of early embryo development begins with the appearance of the blastocoel.

Once in the blastocoel, the mesenchyme cells extend and contract long, thin processes called filopodia.

Tead4-null mice similarly undergo compaction, but fail to generate the blastocoel cavity.

The animal cap forms the roof of the blastocoel and goes on primarily to form ectodermal derivatives.

A blastocoel can be described as the first cell cavity formed as the embryo enlarges.

The vegetal mass is composed of the blastocoel floor and primarily develops into endodermal tissue.

Blastula: hollow ball of cells filled with fluid (blastocoel)

The endoderm of the archenteron will fuse with the ectoderm of the blastocoel wall.

The equatorial or marginal zone, which compose the walls of the blastocoel differentiate primarily into mesodermal tissue.

Fertilization is internal in the dogfish, but eggs are laid at early stages of development, before the formation of the blastocoel.

These presumptive PGCs are brought to the endoderm of the blastocoel by gastrulation.

This cytoplasm moves to the bottom of the blastocoel and eventually ends up as its own subset of endodermal cells.

The first step of gastrulation is the epithelial-to-mesenchymal transition and ingression of primary mesenchyme cells into the blastocoel.

The adjectival of "blastocoel(e)" is blastocoelic.

The blastula stage typically features a fluid-filled cavity, the blastocoel, surrounded by a sphere or sheet of cells, also called blastomeres.

This cavity is not a blastocoel; it is a product of morphogenetic cell movements, not of cleavage.

The blastoderm is composed of two layers, the epiblast and the hypoblast, which enclose the fluid-filled blastocoel cavity.

The blastula is usually a spherical layer of cells (the blastoderm) surrounding a fluid-filled or yolk-filled cavity (the blastocoel).

During early development, the sea urchin embryo undergoes 10 cycles of cell division, resulting in a single epithelial layer enveloping a blastocoel.

The mesoderm and endoderm then migrate animally along the blastocoel roof, driven in part by movement of the vegetal endoderm cells.

Only when the blastocoel is formed does the early embryo become a blastula.

A blastula is a sphere of cells surrounding a blastocoel.

The blastocoel also allows blastomeres to move during the process of gastrulation.

A seal is created by tight junctions of the epithelial cells which line the blastocoel.

This buckles inwards towards the blastocoel in a process called invagination.

The blastula stage of early embryo development begins with the appearance of the blastocoel.

Once in the blastocoel, the mesenchyme cells extend and contract long, thin processes called filopodia.

Tead4-null mice similarly undergo compaction, but fail to generate the blastocoel cavity.

The animal cap forms the roof of the blastocoel and goes on primarily to form ectodermal derivatives.

The vegetal mass is composed of the blastocoel floor and primarily develops into endodermal tissue.

A blastocoel can be described as the first cell cavity formed as the embryo enlarges.

Blastula: hollow ball of cells filled with fluid (blastocoel)

The endoderm of the archenteron will fuse with the ectoderm of the blastocoel wall.

The equatorial or marginal zone, which compose the walls of the blastocoel differentiate primarily into mesodermal tissue.

Fertilization is internal in the dogfish, but eggs are laid at early stages of development, before the formation of the blastocoel.

This cytoplasm moves to the bottom of the blastocoel and eventually ends up as its own subset of endodermal cells.

The first step of gastrulation is the epithelial-to-mesenchymal transition and ingression of primary mesenchyme cells into the blastocoel.

These presumptive PGCs are brought to the endoderm of the blastocoel by gastrulation.

The blastula stage typically features a fluid-filled cavity, the blastocoel, surrounded by a sphere or sheet of cells, also called blastomeres.

The adjectival of "blastocoel(e)" is blastocoelic.

This cavity is not a blastocoel; it is a product of morphogenetic cell movements, not of cleavage.

The blastoderm is composed of two layers, the epiblast and the hypoblast, which enclose the fluid-filled blastocoel cavity.

The blastula is usually a spherical layer of cells (the blastoderm) surrounding a fluid-filled or yolk-filled cavity (the blastocoel).

During early development, the sea urchin embryo undergoes 10 cycles of cell division, resulting in a single epithelial layer enveloping a blastocoel.

The mesoderm and endoderm then migrate animally along the blastocoel roof, driven in part by movement of the vegetal endoderm cells.