Skip to main content

Medical Subject Headings

Search from vocabulary

Content language

Concept information

Embryonic Structures > Embryo, Nonmammalian > Yolk Sac
Animal Structures > Embryo, Nonmammalian > Yolk Sac
Embryonic Structures > Embryo, Mammalian > Extraembryonic Membranes > Yolk Sac
Tissues > Membranes > Extraembryonic Membranes > Yolk Sac

Preferred term

Yolk Sac  

Type

  • Topical Descriptor

Broader concept

Entry terms

  • Embryo Vitelline Sac
  • Embryo Vitelline Sacs
  • Vitelline Sac of Embryo

Scope note

  • 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.

History note

  • 78; was see VITELLINE MEMBRANE 1973-77

In other languages

URI

http://www.yso.fi/onto/mesh/D015017

Download this concept:

RDF/XML TURTLE JSON-LD Created 5/13/77, last modified 7/11/07