![]() This period is most of the first trimester and the second and third trimester is called Fetal Development and is mainly about growth. The human embryonic period proper is divided into 23 Carnegie stages covering the first 8 weeks after fertilisation (post-ovulation). Human stages are based on the external and/or internal features of the embryo, and are not directly dependent on either age or size. Human Carnegie Stages Carnegie stages are named after the famous USA institute which began collecting and classifying embryos in the early 1900's. This movie shows human embryo development between week 3 to 8 after fertilisation. This page can be printed using the lefthand menu "Toolbox" or Printable version. Note some of the links on this page leave the K12 notes section and may be beyond the level of your students, bookmark this page to easily return here. I have also begun to add some simple exercises that can be used in class to help understand concepts in embryonic development and comparison. I am happy to receive feedback as too what you may like to be included here. ![]() I am currently looking to simplify concepts and include images on this page. This is currently only a draft designed to help K12 students understand comparative embryology. K12 Links: Start Here | Week 1 | Week 2 | Week 3 | Week 4 | Week 5 to 8 | Arms and Legs | Heart | Fetus | Brain Growth | Eyes and Ears | Animal Development Times | Humans and Animal Embryology | Comparative Embryology | Thalidomide This page will introduce how we can compare the development of different animal embryos. We now also know that many of the underlying signals that regulate development are the same between these different species. The major difference appears to be how long it takes to reach each of these same stages. K12 Professional Development 2016 Introduction All human and animal embryos go through very similar stages of early development. ייִדיש | Tiếng Việt These external translations are automated and may not be accurate. ![]() Google Translate - select your language from the list shown below (this will open a new external page)
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