File:Spaulding-fig01.jpg

Fig. 1. Carnegie Embryo No. 467

9 mm X 21.

Stage 1, 9 mm. (fig. 1, plate 1). The earliest stage that I have studied is shown in an embryo 9 mm. long. In this specimen the genital tubercle is a very low conical eminence between the umbilical cord and the base of the tail. Its apex is separated from the rest of the tubercle by a pair of converging depressions which unite in the midventral line to form a longitudinal groove extending to the caudal border, giving to the entire groove a Y-shape. Caudal to the arms of the Y and lateral to its stem is a pair of broad, swollen areas. This condition is slightly different from the stage described by Keibel (1896) of the beginning development of the genitalia in a 3-mm. embryo. In his specimen he described the cloacal tubercle as consisting of a pair of eminences separated by the cloacal membrane. The difference between the stage described by Keibel and my first stage may be accounted for entirely by the difference in the size of the two specimens.

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Historic Disclaimer - information about historic embryology pages

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)

Reference

Spaulding MH. The development of the external genitalia in the human embryo. (1921) Contrib. Embryol., Carnegie Inst. Wash. Publ. 81, 13: 69 – 88.

Cite this page: Hill, M.A. (2024, April 25) Embryology Spaulding-fig01.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Spaulding-fig01.jpg

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© Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G

Cite this page: Hill, M.A. (2024, April 25) Embryology Spaulding-fig01.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Spaulding-fig01.jpg

What Links Here?

© Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G