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Bookmark or Share- Embryology | Description & History | BritannicaEmbryology, 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 comparative studies. From the time of the Greek philosopher Aristotle it was debated.
- Human embryonic and fetal development illustrated | BritannicaThe embryo is an early developmental stage of animals. In humans the embryo begins to develop about four days after an egg is fertilized. Appearing initially as a tiny mass of cells, it eventually gives rise to the fetus, an obvious human form. In the first days of the embryo’s existence, it journeys along the fallopian tube.
- Embryo - WikipediaAn embryo is the initial stage of development for a multicellular organism. In organisms that reproduce sexually, embryonic development is the part of the life cycle that begins just after fertilization of the female egg cell by the male sperm cell.
- Human embryonic development - WikipediaEmbryonic development in the human, covers the first eight weeks of development; at the beginning of the ninth week the embryo is termed a fetus . The eight weeks has 23 stages. Human embryology is the study of this development during the first eight weeks after fertilization.
- Embryo vs. Fetus: What’s the Difference? - HealthlineThe embryonic period is all about the formation of important systems of the body. Think of it as your baby’s basic foundation and framework. The fetal period, on the other hand, is more about...
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