Qu'est-ce (qui) est yolk cavity - définition
MEMBRANOUS SAC ATTACHED TO AN EMBRYO, FORMED BY CELLS OF THE HYPOBLAST ADJACENT TO THE EMBRYONIC DISK
Yolk-sac; Yolk sac cavity; Primitive yolk sac; Exocoelomic cavity; Vesicula umbilicalis; Saccus vitellinus; Umbilical vesicle; Yolk sacs; Umbilical vesicles
![Artificially colored, showing [[gestational sac]], yolk sac and [[embryo]] (measuring 3 mm as the distance between the + signs).](https://commons.wikimedia.org/wiki/Special:FilePath/Ultrasound of embryo at 5 weeks, colored.png?width=200 "Artificially colored, showing [[gestational sac]], yolk sac and [[embryo]] (measuring 3 mm as the distance between the + signs).")
![gestational age]] by [[obstetric ultrasonography]].](https://commons.wikimedia.org/wiki/Special:FilePath/Ultrasound of embryo at 5 weeks.png?width=200 "gestational age]] by [[obstetric ultrasonography]].")
![Surface view of embryo of [[Hylobates concolor]] (a gibbon).](https://commons.wikimedia.org/wiki/Special:FilePath/Gray14.png?width=200 "Surface view of embryo of [[Hylobates concolor]] (a gibbon).")
Yolk
![Diagram of a [[fish egg]]; the yolk is the area marked 'C'](https://commons.wikimedia.org/wiki/Special:FilePath/Fish Egg Diagram (1).jpg?width=200 "Diagram of a [[fish egg]]; the yolk is the area marked 'C'")
PART OF AN EGG WHICH FEEDS THE DEVELOPING CHICKEN EMBRYO
Egg yolks; Double-yolked egg; Double-yolker; Double yolker; Double egg yolk; Double yolked egg; Egg-yolk; Yolks; Double yolk; Vitellus; Double yolk egg; Double-yolk egg; Double yolked eggs; Double-yolked eggs; Double yolk eggs; Double-yolk eggs; Double-yolkers; Double-yolk; Double yolks; Double-yolks; Double yolked; Double-yolked; Yellow of the egg; Egg yolk; Egg yellow; Egg yoke
Among animals which produce eggs, the yolk (; also known as the vitellus) is the nutrient-bearing portion of the egg whose primary function is to supply food for the development of the embryo. Some types of egg contain no yolk, for example because they are laid in situations where the food supply is sufficient (such as in the body of the host of a parasitoid) or because the embryo develops in the parent's body, which supplies the food, usually through a placenta.
yolk
PART OF AN EGG WHICH FEEDS THE DEVELOPING CHICKEN EMBRYO
Egg yolks; Double-yolked egg; Double-yolker; Double yolker; Double egg yolk; Double yolked egg; Egg-yolk; Yolks; Double yolk; Vitellus; Double yolk egg; Double-yolk egg; Double yolked eggs; Double-yolked eggs; Double yolk eggs; Double-yolk eggs; Double-yolkers; Double-yolk; Double yolks; Double-yolks; Double yolked; Double-yolked; Yellow of the egg; Egg yolk; Egg yellow; Egg yoke
(yolks)
The yolk of an egg is the yellow part in the middle.
Only the yolk contains cholesterol.
...buttered toast dipped in egg yolk.
N-VAR
Yolk
PART OF AN EGG WHICH FEEDS THE DEVELOPING CHICKEN EMBRYO
Egg yolks; Double-yolked egg; Double-yolker; Double yolker; Double egg yolk; Double yolked egg; Egg-yolk; Yolks; Double yolk; Vitellus; Double yolk egg; Double-yolk egg; Double yolked eggs; Double-yolked eggs; Double yolk eggs; Double-yolk eggs; Double-yolkers; Double-yolk; Double yolks; Double-yolks; Double yolked; Double-yolked; Yellow of the egg; Egg yolk; Egg yellow; Egg yoke
·noun The yellow part of an egg; the vitellus.
II. Yolk ·noun An oily secretion which naturally covers the wool of sheep.
Wikipédia
Yolk sac
The yolk sac is a membranous sac attached to an embryo, formed by cells of the hypoblast layer of the bilaminar embryonic disc. This is alternatively called the umbilical vesicle by the Terminologia Embryologica (TE), though yolk sac is far more widely used. In humans, the yolk sac is important in early embryonic blood supply, and much of it is incorporated into the primordial gut during the fourth week of embryonic development.
