Paper - Two human ova of the pre-villous stage, having a developmental age of about seven and nine days respectively (1945)

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I have decided to take early retirement in September 2020. During the many years online I have received wonderful feedback from many readers, researchers and students interested in human embryology. I especially thank my research collaborators and contributors to the site. The good news is Embryology will remain online and I will continue my association with UNSW Australia. I look forward to updating and including the many exciting new discoveries in Embryology!

Hertig AT. and Rock J. Two human ova of the pre-villous stage, having a developmental age of about seven and nine days respectively. (1945) Contrib. Embryol., Carnegie Inst. Wash. Publ. 557, 31: 65-84.

Online Editor 
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This historic 1945 paper describes early human development in week 2. Draft only.


See also: Rock J. and Hertig AT. Two human ova of the previous stage, having an ovulation age of about eleven and twelve days respectively. (1941) Contrib. Embryol., Carnegie Inst. Wash. Publ.525, 29: 127-156.


Hertig AT. and Rock J. On a normal human ovum not over 7.5 days of age. (1945) Anat. Rec. 91: 281.

Hertig AT. and Rock J. On a normal ovum of approximately 9 to 10 days of age. (1945) Anat. Rec. 91: 281.

Hertig AT. and Rock J. Two human ova of the pre-villous stage, having a developmental age of about eight and nine days respectively. (1949) Contrib. Embryol., Carnegie Inst. Wash. Publ. 583, 33: 169-186.


Links: Carnegie stage 5 | Week 2

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Pages where the terms "Historic" (textbooks, papers, people, recommendations) appear on this site, and sections within pages where this disclaimer appears, indicate that the content and scientific understanding are specific to the time of publication. This means that while some scientific descriptions are still accurate, the terminology and interpretation of the developmental mechanisms reflect the understanding at the time of original publication and those of the preceding periods, these terms, interpretations and recommendations may not reflect our current scientific understanding.     (More? Embryology History | Historic Embryology Papers)

Two Human Ova of the Pre-villous stage, having a Developmental Age of about Seven and Nine Days respectively

Arthur T Hertig
Arthur Tremain Hertig (1904-1990)
John Charles Rock
John Charles Rock (1890-1984)

Arthur T . Hertig and John Rock


Free Hospital for Women, Brookline, Mass., Departments of Pathology, Obstetrics and Gynecology, Harvard Medical School and Department of Embryology, Carnegie Institution of Washington.


Stage5 bf8004.jpg

Carnegie Collection Embryo No. 8004 (stage 5b)



Cite this page: Hill, M.A. (2020, September 18) Embryology Paper - Two human ova of the pre-villous stage, having a developmental age of about seven and nine days respectively (1945). Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Paper_-_Two_human_ova_of_the_pre-villous_stage,_having_a_developmental_age_of_about_seven_and_nine_days_respectively_(1945)

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