"Chorion" 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 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.
Below are MeSH descriptors whose meaning is more general than "Chorion".
Below are MeSH descriptors whose meaning is more specific than "Chorion".
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