chorion membraneGo to external page http://purl.obolibrary.org/obo/UBERON_0003124
The outermost extraembryonic membrane. [ MP:0002836 MESH:A10.615.284.473 ]
uberon_slim, efo_slim, pheno_slim
The outermost extraembryonic membrane.
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]
Structures homologous to the four extraembryonic membranes of reptiles and birds appear in mammals: amnion, chorion, yolk sac, and allantois.[well established][VHOG]
The chorion of placentals is bilaminar as in reptiles and birds, but forms from the trophoblast and includes the ajdacent mesodermal layer [ISBN:0073040584]
- extraembryonic membrane
- mesoderm-derived structure
- has part some chorionic mesenchyme
- adjacent to some embryo
- only in taxon some Amniota
- develops from some amniotic fold
- has part some chorionic ectoderm