胚胎外的 extraembryonic
- 耳朵是由,胚胎的外胚层发育来了。
First is that the ear develops from the surface layer of the embryo. - 发育8天后,老鼠早期胚胎的,外胚层开始增厚。
This surface layer thickens at an early stage in a mouse after 8 days of development. - 绒毛位于胚胎的外侧面,在哺乳动物称为腹节,表现出典型的环行运动,将化学物质引导到机体的左侧面。
Cilia on the outer surface of the embryo's underside, an area called the ventral node in mammals, exhibit a characteristic twirling movement that wafts chemical messengers over to the left side.
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