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NAL Agricultural Thesaurus
U.S. Department of Agriculture

Concept Breadcrumbs

Fields of Study > anatomy and morphology > embryonic structures > embryo (animal) > extraembryonic membranes
Preferred Term:

extraembryonic membranes

Definition:
The thin layers of tissue that surround the developing embryo. There are four extra-embryonic membranes commonly found in vertebrates, such as reptiles; birds; and mammals. They are the yolk sac, the allantois, the amnion, and the chorion. These membranes provide protection and means to transport nutrients and wastes.
Concept Schemes:
NALT Full
NALT Core
Broader Concept:
embryo (animal)
Narrower Concepts:
Related Concepts:
Entry Terms:
  • extra-embryonic membranes
  • foetal membranes
  • fetal membranes
URI:
https://lod.nal.usda.gov/nalt/105267
Download this Concept:
RDF/XMLCreated 2006-01-19, last modified 2013-09-05
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