| 单词 | umbilical vesicle |
| 例句 | The yelk-sac is reduced to a small pear-shaped umbilical vesicle; its thin pedicle, the long vitelline duct, is enclosed in the umbilical cord. The Evolution of Man — Volume 1 The very wide opening, through which the gastric cavity at first communicates with the umbilical vesicle, becomes narrower and narrower, and at last disappears altogether. The Evolution of Man — Volume 1 This is the yelk-sac, or "umbilical vesicle," the origin of which we have considered previously. The Evolution of Man — Volume 1 In the same way, the yelk-sac or the umbilical vesicle is not a foreign external appendage of the embryo, but an outlying part of its primitive gut. The Evolution of Man — Volume 1 However, the larger part of the embryonic vesicle of the mammal is not directly used for building up the later body, but for the construction of the temporary umbilical vesicle. The Evolution of Man — Volume 1 These vessels naturally atrophy with the degeneration of the umbilical vesicle, and the vitelline circulation is replaced by a second, that of the allantois. The Evolution of Man — Volume 1 |
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