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What (who) is umbilical vesicle - 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
¦ noun Zoology a membranous sac containing yolk attached to the embryos of reptiles and birds and the larvae of some fishes.
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.
Umbilical hernia
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![In more severe cases of umbilical hernias, the [[small intestine]] can poke out through the opening. This can very rarely cause [[ischemia]] and [[necrosis]] of the intestine and is potentially life-threatening. The bulge is often caused by fat or parts of the [[greater omentum]].](https://commons.wikimedia.org/wiki/Special:FilePath/Umbilical hernia growth.gif?width=200 "In more severe cases of umbilical hernias, the [[small intestine]] can poke out through the opening. This can very rarely cause [[ischemia]] and [[necrosis]] of the intestine and is potentially life-threatening. The bulge is often caused by fat or parts of the [[greater omentum]].")
INTESTINAL DISEASE CHARACTERIZED BY THE PROTRUSION BY PART OF THE INTESTINE THOUGH AN OPENING IN THE ABDOMINAL MUSCLES
Hernia, umbilical; Adult umbilical hernia; Hernia umbilicalis; Umbilical Hernia; Congenital umbilical hernia
An umbilical hernia is a health condition where the abdominal wall behind the navel is damaged. It may cause the navel to bulge outwards—the bulge consisting of abdominal fat from the greater omentum or occasionally parts of the small intestine.
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.
