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畸胎发生(teratogenesis)是指由环境物质干扰了正常胚胎发育造成的先天性畸形。畸胎是指异常发育的胚胎。这些异常与通常所谓的“先天缺陷”的涵义基本上相同,唯一的差别是由产伤引起的缺陷不算胚胎发育异常。能引起畸胎的化学物质称为致畸原(teratogens)。这类畸形是不会遗传的。另一类由于细胞遗传物质发生改变而造成的先天性畸形,称为突变(mutation),它是可以遗传给后代的。
Teratogenesis (teratogenesis) refers to the environmental substances interfere with the normal embryonic development caused by congenital malformations. Teratology refers to the abnormal development of the embryo. These anomalies are basically the same meaning as the so-called “birth defects”, with the only difference being that defects caused by birth trauma are not considered as abnormal embryonic development. Chemicals that cause teratology are called teratogens. This type of deformity is not inherited. Another type of congenital malformation caused by changes in cytogenetic material, known as mutation, can be passed on to offspring.