chorion membrane
http://upload.wikimedia.org/wikipedia/commons/5/51/Gray24.png
NCIT:C34124
NCIT:C34122
CALOHA:TS-0144
The chorion of placentals is bilaminar as in reptiles and birds, but forms from the trophoblast and includes the ajdacent mesodermal layer [ISBN:0073040584]
Extra-embryonic ectoderm
EV:0100121
The outermost extraembryonic membrane of amniotes.
uberon
chorion frondosum
fetal chorion
The outer membrane enclosing the embryo in reptiles, birds, and mammals. [TFD][VHOG]
uterine chorion
EMAPA:16112
MESH:A16.254.403.473
chorion (vertebrates)
EHDAA2:0000245
EHDAA:150
chorionic
VHOG:0000200
Structures homologous to the four extraembryonic membranes of reptiles and birds appear in mammals: amnion, chorion, yolk sac, and allantois.[well established][VHOG]
embryonic chorion
UMLS:C0008503
EFO:0002780
UMLS:C1516505
UBERON:0003124
chorion
GAID:1299
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].
chorionic sac
BTO:0000252
This term refers to the amniote structure. It is distinct from the concept of chorion in insects
FMA:80224
mesoderm-derived structure
extraembryonic membrane