chorioallantois


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Related to chorioallantois: chorioallantoic

chorioallantois

 [kor″e-o-ah-lan´to-is]
an extraembryonic structure formed by union of the chorion and allantois, which by means of vessels in the associated mesoderm serves in gas exchange; in many mammals, it forms the placenta. adj., adj chorioallanto´ic.

cho·ri·o·al·lan·to·is

(kō'rē-ō-ă-lan'tō-is),
Extraembryonic membrane formed by the fusion of the allantois with the serosa or false chorion. In mammalian embryos, it forms the fetal portion of the placenta; in avian embryos, it is fused with the shell.

chorioallantois

(kôr′ē-ō′ə-lăn′tō-ĭs)
n.
The highly vascular fetal membrane that consists of the fused chorion and allantois, found adjacent to the eggshell in reptiles and birds and constituting the placenta in most mammals.

cho′ri·o·al′lan·to′ic (-ō-ăl′ən-tō′ĭk) adj.

cho·ri·o·al·lan·to·is

(kōr'ē-ō-ă-lan'tō-is)
Extraembryonic membrane formed by the fusion of the allantois with the serosa or false chorion. In mammals it forms the fetal portion of the placenta; in avian embryos it is fused with the shell.
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