Chorion

The outermost extra-embryonic membrane surrounding the developing embryo. In REPTILES and BIRDS, it adheres to the shell and allows exchange of gases between the egg and its environment. In MAMMALS, the chorion evolves into the fetal contribution of the PLACENTA.

Year introduced: 1978(1975)

PubMed search builder options

Subheadings:

Restrict to MeSH Major Topic.

Do not include MeSH terms found below this term in the MeSH hierarchy.

Tree Number(s): A10.615.284.473, A16.254.750.473

MeSH Unique ID: D002823

Entry Terms:

• Chorions

Previous Indexing:

• Fetal Membranes (1966-1974)

See Also:

• Chorioallantoic Membrane

All MeSH Categories
Anatomy Category
Tissues
Membranes
Extraembryonic Membranes
Chorion
Chorionic Villi

All MeSH Categories
Anatomy Category
Embryonic Structures
Embryo, Mammalian
Extraembryonic Membranes
Chorion
Chorionic Villi