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Yolk


yolk
stored food in the egg's cytoplasm
Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby ...
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Yolk
[ME yolke - the yolk, the yellow part]. Nutritive stores found within the ovum cytoplasm consisting of proteins and fats.
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membrane-bound discs containing high concentrations of yolk found in eggs.
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z ...
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yolk sac The stored food reserve (yolk) and its surrounding membranes, which is found in embryonic reptiles, birds, and mammals.
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yolk sac
One of four extraembryonic membranes that supports embryonic development; the first site of blood cells and circulatory system function.
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yolk sac - the first of four extraembryonic membranes of amniotes to form during embryogenesis. Like the allantois, it arises from the splanchnopleure (endoderm and splanchnic mesoderm) to surround the mass of yolk in reptile and bird eggs.
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yolk sac An extraembryonic membrane enclosing and absorbing the yolk of amniote embryos. It is formed from a layer of endoderm and a layer of splanchnic mesoderm (splanchnopleure).
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yolk plug
In amphibians, when the opening of the archenteron, the blastopore, is filled with yolk-rich cells, it is called the yolk plug.
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amnion
yolk sac
chorion, and
allantois
In birds and most reptiles, the embryo with its extraembryonic membranes develops within a shelled egg.
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The shape of the early embryo is a result of different yolk concentrations in the eggs. Birds' and reptiles' eggs are heavily yolked. Their eggs develop similarly to amphibians except the yolk has deformed the shape of the embryo.
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By the end of the 8th division most nuclei have migrated to the surface, surrounding the yolk sac (leaving behind only a few nuclei, which will become the yolk nuclei).
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Lecithotrophic larva. A planktonic-dispersing larva that lives off yolk supplied via the egg
Leeward. The side of an island opposite from the one facing a persistent wind ...
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Separation of the embryo
The yolk-sac
Development of the fetal membranes and placenta
The branchial region
Development of the body cavities
The form of the embryo at different stages of its growth ...
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About 5000 nuclei accumulate in the unseparated cytoplasm of the oocyte before they migrate to the surface and are encompassed by plasma membranes to form cells surrounding the yolk sac.
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