"Yolk Sac" is a descriptor in the National Library of Medicine's controlled vocabulary thesaurus,
MeSH (Medical Subject Headings). Descriptors are arranged in a hierarchical structure,
which enables searching at various levels of specificity.
The first of four extra-embryonic membranes to form during EMBRYOGENESIS. In REPTILES and BIRDS, it arises from endoderm and mesoderm to incorporate the EGG YOLK into the DIGESTIVE TRACT for nourishing the embryo. In placental MAMMALS, its nutritional function is vestigial; however, it is the source of INTESTINAL MUCOSA; BLOOD CELLS; and GERM CELLS. It is sometimes called the vitelline sac, which should not be confused with the VITELLINE MEMBRANE of the egg.
| Descriptor ID |
D015017
|
| MeSH Number(s) |
A10.615.284.981 A16.254.750.981 A16.331.800
|
| Concept/Terms |
Yolk Sac- Yolk Sac
- Sac, Yolk
- Sacs, Yolk
- Yolk Sacs
- Vitelline Sac of Embryo
- Embryo Vitelline Sac
- Embryo Vitelline Sacs
|
Below are MeSH descriptors whose meaning is more general than "Yolk Sac".
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