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Cosa (chi) è yolk sac - definizione
Yolk sac
![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).")
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
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
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
¦ 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.
Esempi dal corpus di testo per 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.