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Embryology - Wikipedia
Embryology (from Greek ἔμβρυον, embryon, "the unborn, embryo"; and -λογία, -logia) is the branch of animal biology that studies the prenatal development of gametes (sex cells), fertilization, and development of embryos and fetuses. Additionally, embryology encompasses the study of congenital … 展开
Preformationism and epigenesis
As recently as the 18th century, the prevailing notion in western human embryology was preformation: the idea that semen contains an … 展开Until the birth of modern embryology through observation of the mammalian ovum by Karl Ernst von Baer in 1827, there was no clear scientific understanding of embryology, although … 展开
Medical embryology is used widely to detect abnormalities before birth. 2-5% of babies are born with an observable abnormality and medical … 展开
After the 1950s, with the DNA helical structure being unraveled and the increasing knowledge in the field of molecular biology 展开
Evolutionary embryology is the expansion of comparative embryology by the ideas of Charles Darwin. Similarly to Karl Ernst von Baer's principles that explained why many species often appear similar to one another in early developmental stages, Darwin argued that the … 展开
Many principles of embryology apply to invertebrates as well as to vertebrates. Therefore, the study of invertebrate embryology has advanced the study of vertebrate embryology. However, there are many differences as well. For example, numerous … 展开
CC-BY-SA 许可证中的维基百科文本 Human embryonic development - Wikipedia
Implantation (embryology) - Wikipedia
Embryonic Development - Embryology
网页This page shows some key events of human development during the embryonic period of the first eight weeks (weeks 1 - 8) following fertilization. This period is also considered the organogenic period, when most …
Embryology
网页Welcome to the Embryology education and research website now in the 28th year online! There are many ways to find specific topics. Click on the left image term, or use the menu items at the page top, or the search …
Embryology - Simple English Wikipedia, the free encyclopedia
First complete model of the human embryo - Nature
网页2021年3月17日 · Early in development, human embryos form a structure called the blastocyst. Two research groups have now generated human blastocyst-like structures from cells in a dish, providing a valuable model...
Embryology | Description & History | Britannica
网页Embryology, the study of the formation and development of an embryo and fetus. Before widespread use of the microscope and the advent of cellular biology in the 19th century, embryology was based on descriptive and …