| 单词 | allantois |
| 释义 | allantois (once / 73412 pages) n WORD FAMILY allantois USAGE EXAMPLESThe division of Vertebrata in which the embryo develops an allantois. Webster, Noah, Webster's Unabridged Dictionary(2012) In Mammalia the allantois is not so largely developed as in Birds, and it enters largely into the formation of the placenta. Various, The New Gresham Encyclopedia. Vol....(2010) Diagram of chick showing relations of amnion, allantois and yolk. Morgan, Thomas Hunt, A Critique of the Theory of Evoluti...(2010) n the vascular fetal membrane that lies below the chorion and develops from the hindgut in many embryonic higher vertebrates (reptiles, birds and mammals) Hyper fetal membrane any membrane that functions for the protection or nourishment or respiration or excretion of a developing fetus |
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