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English: The embryo is drawn in grey, the prospective eye regions white. Dashed contours show the previous location of the embryo. The location of the body on the back side of the egg is drawn dotted. Compensatory movements can be observed between 14:40 and 16:40 p.f.
This layer functions in protection by allowing the embryo to develop in a hypotonic solution so the cell will not burst. [5] Finally, the third set of blastomeres are the deep cells. These deep cells are located between the enveloping layer and the yolk syncytial layer and eventually give rise to the embryo proper.
Epiboly in zebrafish is the first coordinated cell movement, beginning at the dome stage late in the blastula period and continuing throughout gastrulation. [3] At this point the zebrafish embryo contains three portions: an epithelial monolayer known as the enveloping layer (EVL), a yolk syncytial layer (YSL) which is a membrane-enclosed group of nuclei that lie on top of the yolk cell, and ...
The development of a single zebrafish retina captured on a light sheet microscope approx. every 12 hours from 1.5 days to 3.5 days after birth of the embryo Another notable characteristic of the zebrafish is that it possesses four types of cone cell , with ultraviolet -sensitive cells supplementing the red, green and blue cone cell subtypes ...
It is known in zebrafish embryos, for example, that by 3 days after fertilization each of the cell classes found in the adult fish—melanophores, xanthophores and iridophores—are already present. Studies using mutant fish have demonstrated that transcription factors such as kit , sox10 , and mitf are important in controlling chromatophore ...
In zebrafish, as well as in additional transcriptomic datasets of Drosophila, the mosquito Anopheles and the nematode Caenorhabditis elegans, the authors found that genes expressed during mid-development are older than those expressed at the beginning and end of development, supporting the hourglass model.
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Embryo of Zebrafish undergoing cleavage. The blastodisc, also called the germinal disc, is the embryo-forming part on the yolk of the egg of an animal that undergoes discoidal meroblastic cleavage. [1] Discoidal cleavage occurs in those animals with a large proportion of yolk in their eggs, and include insects, fish, reptiles and birds. [2]