#neurulation

Video of Volvox embryo turning itself inside out

Researchers has managed to film a 3D video of a they call as the “most important time in your life”. The live embryo was clearly seen shape-shifting from a sphere to a mushroom and back to a sphere again. The behavior or the organism will help the team understand an important mechanical process in the development of early animals.

Researchers captured the first 3D images of a green alga known as

Synonyme: Neuroporus cranialis, Neuroporus rostralis Englisch: anterior neuropore, cranial neuropore, rostral neuropore

1 Definition

Der Neuroporus anterior ist eine vorübergehende Öffnung des embryonalen Neuralrohrs, die sich gegen Ende der 4. Entwicklungswoche, etwa am 24.-25. Embryonaltag (zwei Tage vor dem Schluss des Neuroporus posterior), schließt.

2 Klinik

Die Höhe des Neuroporus anterior…

Synonym: Kompaktierung Englisch: compaction 1 Definition

Als Compaction bzw. Kompaktierung bezeichnet man im Rahmen der Embryonalentwicklung das Ausbilden von Zellkontakten im zuvor losen Zellverband der Morula.

2 Aufbau

Die äußeren Zellen bilden durch Tight junctions und Gap junctions einen dichten Ring, die inneren formen den späteren Embryo. Durch die Differenzierung in den innen gelegenen…

Neurulation in vertebrates results in the formation of the neural tube, which gives rise to both the spinal cord and the brain. Neural crest cells are also created during neurulation.  Neural crest cells migrate away from the neural tube and give rise to a variety of cell types, including pigment cells and neurons.

Neurulation begins with the formation of a neural plate, a thickening of the ectoderm caused when cuboidal epithelial cells become columnar. Changes in cell shape and cell adhesion cause the edges of the plate fold and rise, meeting in the midline to form a tube. The cells at the tips of the neural folds come to lie between the neural tube and the overlying epidermis. These cells become the neural crest cells. Both epidermis andneural plate are capable of giving rise to neural crest cells.