yolk
stored food in the egg's cytoplasm
Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby ...
Yolk
[ME yolke - the yolk, the yellow part]. Nutritive stores found within the ovum cytoplasm consisting of proteins and fats.
Like the allantois, it arises from the splanchnopleure (endoderm and splanchnic mesoderm) to surround the mass of yolk in reptile and bird eggs. It is connected to the midgut by the yolk stalk.
The Yolk-sac
The yolk-sac (Figs. 22 and 23) is situated on the ventral aspect of the embryo; it is lined by entoderm, outside of which is a layer of mesoderm.
yolk
The stored food in egg cells that nourishes the embryo.
yolk sac ...
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.
yolk plug
In amphibians, when the opening of the archenteron, the blastopore, is filled with yolk-rich cells, it is called the yolk plug.
Z
zygospore
A thick-walled resting spore that is formed from the union of similar gametes.
Yolk plug
(Date:3/29/2011)... (March 29, 2011)A new interventional radiology treatment ... prostate glands shows comparable clinical results to ... considered the gold standard (or most common) ... embolizationhas none of the risks associated with ...
yolk sac The stored food reserve (yolk) and its surrounding membranes, which is found in embryonic reptiles, birds, and mammals.
amnion
yolk sac
chorion, and
allantois
In birds and most reptiles, the embryo with its extraembryonic membranes develops within a shelled egg.
Blastocoele - Yolk sack/exocoelomic cavity - Heuser's membrane - Extraembryonic coelom - Vitelline duct
Umbilical cord (Umbilical artery, Umbilical vein, Wharton's jelly) - Allantois ...
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.
a structure which the females of certain animal species lay as a means of reproduction, it contains a fertilized zygote and nutrition in the form of yolk for the developing offspring, sometimes contains other substances (e.g.
Lecithin a phospholipid found in egg yolk (used as an emulsifying agent)
(lecithos = egg yolk)
Anton van Leeuwenhoek person who lived in the 1600s and was the first person to see sperm cells‚ in which he thought he could see a homunculus ...
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 ...
development; (2) abnormal brain function, resulting in epilepsy; (3) defective kidney function, resulting in juvenile death; (4) perinatal death, possibly due to skull or brain abnormalities; (5) early embryonic death due to a failure of yolk-sac ...
The egg, on the other hand, accumulates an unusually large amount of cytoplasm which is filled with ribosomes, mitochondria, and nutrients (yolk) to provide sufficient nutrients during cleavage of the zygote to form the embryo.
 See also: Cells, Embryo, Membrane, Human, Organ
|
