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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 ...
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.
The zebrafish embryo develops rapidly, with precursors to all major organs appearing within 36 hours of fertilization. The embryo begins as a yolk with a single enormous cell on top (see image, 0 h panel), which divides into two (0.75 h panel) and continues dividing until there are thousands of small cells (3.25 h panel).
2.7 Electron Micrograph of a Zebrafish Embryo 281 Gigapixels (August 2012) 2.8 Shanghai 272 Gigapixels (December 2010) 2.9 Arcachon 228 Gigapixels (October 2015)
The aorta-gonad-mesonephros (AGM) region is an area derived from splanchnopleura mesoderm identified in embryonic humans, mice, and non-mammalian vertebrates such as birds and zebrafish. It contains the dorsal aorta, genital ridges and mesonephros and lies between the notochord and the somatic mesoderm, extending from the umbilicus to the ...
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. During this period those cells that will form the eyes migrate anti-clockwise (perspective of the embryo), whereas the future mid- and hindbrain cells migrate clockwise between 15:15 and 16:40 h (arrows).
Zebrafish PGCs are specified at four different locations within the early embryo via inheritance of germ plasm (a mixture of RNA and protein often associated with mitochondria). [8] [3] Germ cells from these four locations will then migrate dorsally after down-regulation of the rgs14a G-protein which regulates E-cadherin. [1]
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]