胚胎学：研究胚胎和胎儿的形成和发育的学科。
Study of the formation and development of an embryo and fetus.
胚胎(胎儿)发育是遗传信息和环境因素相互作用的编程过程。
The development of embryo and fetus is a programmed process by which one's genotype interacts with the environment to produce its phenotype.
在胚胎发育期，胎儿通过新血管化过程(其内皮细胞源于祖细胞)和新生血管形成过程(新血管由旧血管芽生而来)生成毛细血管。
During embryogenesis, capillaries develop in the fetus by neovascularization, where endothelial cells arise from progenitor cells; and angiogenesis, in which new blood vessels sprout from old ones.
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