| 单词 | embryonic membrane |
| 例句 | He said the structures include all embryonic membranes as well as membranes outside the embryo. Scientists use stem cells to create models of human embryos and study our earliest days 2023-06-27T04:00:00Z These embryonic membranes and the lack of a larval stage distinguish amniotes from tetrapod amphibians. Fundamentals of Biology 2015-01-01T00:00:00Z Four embryonic membranes form to support the growing embryo: the amnion, the yolk sac, the allantois, and the chorion. Anatomy and Physiology 2013-06-19T00:00:00Z In some parasitic Hymenoptera there is only a single embryonic membrane formed by delamination from the blastoderm, while in a few insects, including the wingless spring-tails, the embryonic membranes are vestigial or entirely wanting. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 4 "Hero" to "Hindu Chronology" 2012-04-04T02:00:56.447Z Cenogenetic processes, on the other hand, include such phenomena as the formation of yolk and the embryonic membranes, the temporary allantoic circulation, the navel, the curved and contracted shape of the embryo, and the like. Form and Function A Contribution to the History of Animal Morphology Wheeler, however, compares with the “dorsal organ” the peculiar extra embryonic membrane or indusium which he has observed between serosa and amnion in the embryo of the grasshopper Xiphidium. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 4 "Hero" to "Hindu Chronology" 2012-04-04T02:00:56.447Z |
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