Terminology Service for NFDI4Health
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chorion

Go to external page http://purl.obolibrary.org/obo/UBERON_0003124

the outermost extraembryonic membrane [ ]

Term info

Label

chorion

Synonyms
  • chorion (vertebrates)
  • embryonic chorion
  • fetal chorion
  • uterine chorion
database cross reference
Subsets

uberon_slim, efo_slim, pheno_slim

depicted by

http://upload.wikimedia.org/wikipedia/commons/5/51/Gray24.png

development notes

Extra-embryonic ectoderm

external definition

The outer membrane of the two membranes enclosing the embryo in reptiles, birds, and mammals. In placental mammals it contributes to the development of the placenta[BTO:0000252]., The outer membrane enclosing the embryo in reptiles, birds, and mammals. [TFD][VHOG]

has related synonym

chorionic sac, chorion frondosum

homology notes

Structures homologous to the four extraembryonic membranes of reptiles and birds appear in mammals: amnion, chorion, yolk sac, and allantois.[well established][VHOG]

id

UBERON:0003124

taxon notes

The chorion of placentals is bilaminar as in reptiles and birds, but forms from the trophoblast and includes the ajdacent mesodermal layer [ISBN:0073040584]