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A. Morula and B. cross section of a blastula displaying the blastocoel and blastoderm of early animal embryonic development. Blastulation is the stage in early animal embryonic development that produces the blastula. In mammalian development, the blastula develops into the blastocyst with a differentiated inner cell mass and an outer trophectoderm.
[10] [11] Like the more southwestern population, the Danish North Sea population has a long, pointed snout and an inferior mouth, and it is anadromous, spending most of its adult life in coastal waters, but migrating into rivers to breed (some other European Coregonus occur in brackish water, but the ability to live long-term in full salt water ...
Coregonus is a diverse genus of fish in the salmon family ().The Coregonus species are known as whitefishes.The genus contains at least 68 described extant taxa, but the true number of species is a matter of debate.
Lake whitefish are found throughout much of Canada and parts of the northern United States, including all of the Great Lakes. The lake whitefish is sometimes referred to as a "humpback" fish due to the small size of the head in relation to the length of the body. [3] [a] It is a valuable commercial fish, and also occasionally taken by sport ...
Cavitation is the formation of the blastocoel, a fluid-filled cavity that defines the blastula, or in mammals the blastocyst. [1] After fertilization , cell division of the zygote occurs which results in the formation of a solid ball of cells ( blastomeres ) called the morula .
A blastoderm (germinal disc, blastodisc) is a single layer of embryonic epithelial tissue that makes up the blastula. [1] It encloses the fluid-filled blastocoel. Gastrulation follows blastoderm formation, where the tips of the blastoderm begins the formation of the ectoderm, mesoderm, and endoderm. [2]
The BCNE center is found to secrete several factors: chordin, [8] noggin, [8] Xnr3, [8] siamois, [8] goosecoid, [11] twin, [10] Admp, [10] and FoxA4a. [10] This center predisposes cells in the blastula stage to become neural tissue. [8] The cells of the BCNE region give rise to the forebrain, most of the mid-brain and hind-brain, the notochord ...
The inward migration of these cells, known as bottle cells, leads to the formation of the archenteron, a process analogous to that observed in the gastrulation of sea urchins. Gastrulation in frogs commences in the marginal zone— the region encircling the blastula's equator where the animal and vegetal hemispheres meet—differing from sea ...
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