UNSW Embryology

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UNSW Embryology Embryology Carnegie Stages Home Page Page Links Introduction Carnegie Stage Table Human Embryo Other Pages: Stages Homepage | Species Stage Comparisons Homepage | Stage Sequence | Embryo Growth Movie Introduction This current page has images of Carnegie stage 7 to 23 of Human embryonic development organized as a table showing dates and features for each stage. Clicking on the small image will open a large image version of that stage. Note that images are not to scale. There is another Carnegie Stage page with larger images of each stage. This material is from the Kyoto Collection and is reproduced with the permission of Prof. Kohei Shiota for tutorial/revision purposes and cannot be Fetus by Leonardo da reproduced electronically or in writing without permission. Vinci Carnegie Stage Table Images Days Somite Stage Size (mm) (not to scale, click Events (approx) Number image to see original) 1 1 0.1-0.15 fertilized oocyte (week 1) inner and outer cell 2 2 - 3 0.1-0.2 mass 3 4 - 5 0.1-0.2 free blastocyst 4 5 - 6 0.1-0.2 attaching blastocyst 7 - 12 5 0.1-0.2 implantation (week 2) extraembryonic 6 13 - 15 0.2 mesoderm, primitive streak 15 - 17 gastrulation, 7 0.4 (week 3) notochordal process primitive pit, 8 17 - 19 1.0 - 1.5 notochordal canal neural folds, cardiac 9 19 - 21 1.5 - 2.5 1 - 3 primordium, head fold 22 - 23 10 2 - 3.5 4 - 12 neural fold fuses (week 4) rostral neuropore 11 23 - 26 2.5 - 4.5 13 - 20 closes caudal neuropore 12 26 - 30 3 - 5 21 - 29 closes 28 - 32 leg buds, lens 13 4 - 6 30 (week 4) placode Approximate stage 13/14 of the pig enbro serial series in Embryology Program 14 31 - 35 5 - 7 lens pit, optic cup lens vesicle, nasal 15 35 - 38 7 - 9 pit, hand plate 37 - 42 nasal pits moved 16 8 - 11 ventrally, auricular (week 6) hillocks, foot plate 17 42 - 44 11 - 14 finger rays 44 - 48 ossification 18 13 - 17 (week 7) commences straightening of 19 48 - 51 16 - 18 trunk 51 - 53 upper limbs longer 20 18 - 22 (week 8) and bent at elbow hands and feet 21 53 - 54 22 - 24 turned inward eyelids, external ears Approximate stage 22 54 - 56 23 - 28 of human serial series in Embryology Program rounded head, body 23 56 - 60 27 - 31 and limbs [Source: Rothenburger and Gay, 1995. and others] About Notes Links These notes from the Embryology Program compiled and written by Dr Mark Hill. Serial Sections This material is from the Kyoto Collection and is reproduced with Homepage the permission of Prof. Kohei Shiota for tutorial/revision purposes Human and cannot be reproduced electronically or in writing without Homepage permission. Acknowledgements Pig Homepage UNSW Embryology Homepage [email protected] Date Last Modified: 19/3/99 This site maintained by Dr M. Hill.

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When Does Human Life Begin? the Scientific Evidence and Terminology Revisited
University of St. Thomas Journal of Law and Public Policy Volume 8 Issue 1 Fall 2013 Article 4 January 2013 When Does Human Life Begin? The Scientific videnceE and Terminology Revisited Maureen L. Condic Follow this and additional works at: https://ir.stthomas.edu/ustjlpp Part of the Family Law Commons, and the Health Law and Policy Commons Recommended Citation Maureen L. Condic, When Does Human Life Begin? The Scientific videnceE and Terminology Revisited, 8 U. ST. THOMAS J.L. & PUB. POL'Y 44 (2013). Available at: https://ir.stthomas.edu/ustjlpp/vol8/iss1/4 This Article is brought to you for free and open access by UST Research Online and the University of St. Thomas Journal of Law and Public Policy. For more information, please contact the Editor-in-Chief at [email protected]. WHEN DOES HUMAN LIFE BEGIN? THE SCIENTIFIC EVIDENCE AND TERMINOLOGY REVISITED MAUREEN L. CONDIC* The question of when human life begins continues to be a source of ethical and political controversy. In this debate, the language used by many medical textbooks fosters significant misinterpretation of the scientific facts. In particular, terminology that refers to the product of sperm-egg fusion as a "penetrated oocyte" and claims that the zygote does not form until syngamy (approximately twenty-four hours after sperm-egg fusion) have resulted in the erroneous belief that a human embryo does not exist during the period prior to this point (i.e. the "pre-zygote error"). Yet an objective view of the modem scientific evidence supports only a single definition of the term "zygote": a one-cell human organism (i.e.
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Embryo Makes Contact with the Endometrial Lining of the Uterus
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Embryology and Fetal Development 2016.Pages
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Early Human Development and the Chief Sources of Information on Staged Human Embryos
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The Neural Crest and Craniofacial Malformations
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Embryo Development
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