Paper - Normal and abnormal development of human embryos: Difference between revisions
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[[File:Hideo Nishimura.jpg|thumb|alt=Hideo Nishimura (1912–1995)|link=Embryology History - Hideo Nishimura|Hideo Nishimura (1912–1995)]] | [[File:Hideo Nishimura.jpg|thumb|alt=Hideo Nishimura (1912–1995)|link=Embryology History - Hideo Nishimura|Hideo Nishimura (1912–1995)]] | ||
This survey of the development of a large number of virtually unselected human embryos from healthy women allowed us to establish more reliable standards of normal development with respect to crown-rump length, body weight, and external form than those usually cited. Remarkable variation was noted with regard to the relation between clinical age and these attributes and thus it is concluded that crown-rump length and body weight are more reliable indicators of the general state of development than clinically established age. | |||
Dead embryos occurred with a significantly greater frequency in women with a history of genital bleeding during pregnancy than in those without. Externally malformed embryos were found with increasing frequency with advancing developmental stage, with the maximum figure of 3.92% at horizons 19–23. Malformations observed included external defects such as exencephaly, cyclopia, myeloschisis, cleft lip, and several limb malformations. It is of considerable interest that the incidence of most of these defects was far higher than that observed in newborn infants. | |||
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Nishimura H. Takano K. Tanimura T, and Yasuda M. Normal and abnormal development of human embryos: First report of the analysis of 1,213 intact embryos. (1968) Teratology, 1: 281-290. PubMed 5759548
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This historic 1968 paper by Nishimura and colleagues describes human embryos from the Kyoto Collection.
Modern Notes:
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Normal and Abnormal Development of Human Embryos: First Report of the Analysis of 1,213 Intact Embryos
This survey of the development of a large number of virtually unselected human embryos from healthy women allowed us to establish more reliable standards of normal development with respect to crown-rump length, body weight, and external form than those usually cited. Remarkable variation was noted with regard to the relation between clinical age and these attributes and thus it is concluded that crown-rump length and body weight are more reliable indicators of the general state of development than clinically established age.
Dead embryos occurred with a significantly greater frequency in women with a history of genital bleeding during pregnancy than in those without. Externally malformed embryos were found with increasing frequency with advancing developmental stage, with the maximum figure of 3.92% at horizons 19–23. Malformations observed included external defects such as exencephaly, cyclopia, myeloschisis, cleft lip, and several limb malformations. It is of considerable interest that the incidence of most of these defects was far higher than that observed in newborn infants.
Cite this page: Hill, M.A. (2024, June 18) Embryology Paper - Normal and abnormal development of human embryos. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Paper_-_Normal_and_abnormal_development_of_human_embryos
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G