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What (who) is yolk-sac - definition
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 sac
The yolk sac is a membranous [attached to an embryo], formed by cells of the [[hypoblast adjacent to the bilaminar embryonic disc. This is alternatively called the umbilical vesicle by the Terminologia Embryologica (TE), though yolk sac is far more widely used.
yolk sac
¦ noun Zoology a membranous sac containing yolk attached to the embryos of reptiles and birds and the larvae of some fishes.
Endodermal sinus tumor
GERM CELL CANCER THAT HAS MATERIAL BASIS IN CELLS THAT LINE THE YOLK SAC OF THE EMBRYO
Yolk sac tumor; Endodermal sinus tumour; Yolk sac tumour
Endodermal sinus tumor (EST) is a member of the germ cell tumor group of cancers. It is the most common testicular tumor in children under three, and is also known as infantile embryonal carcinoma.
Wikipedia
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.
Examples of use of yolk-sac
1. The babies then hide under stones where they eat their yolk–sac.
2. The caviar–based creams are produced by extracting vitelline – or yolk sac – from the sturgeon eggs.