File:Spaulding-fig20.jpg

Fig. 20. Carnegie Embryo No.1900-60a.

25 mm., female. X 6

Stage 8, 24 to 28 mm. CR (fig. 16, fig. 17, males; fig. 20, fig. 21, females). This stage is represented by an exceedingly interesting pair of twins. In the male (fig. 16) the nearly cylindrical phallus projects at approximately right angles to the body axis, in marked contrast to a pronounced decurvature of that of its mate (fig. 20). The glans is not so sharply demarked as in the female, although there are slight indications of its extent. The urogenital opening extends almost to the tip of the phallus as a shallow, open groove deepened basally by the caudally extended, platelike urethral folds. As a result of this increase in the folds, the base of the phallus is considerably longer than its apex. The labio-scrotal swellings are separated from the base of the phallus by broad, shallow grooves; their tips curve cranio-laterally away from the phallus, leaving a rather broad, unswollen area between the latter and the umbilical cord.

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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-fig20.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Spaulding-fig20.jpg

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

Reference

Spaulding, M.H., The development of the external genitalia in the human embryo. Contributions to Embryology Carnegie Institution No.61 (1921). With four plates and two text-figures.

Cite this page: Hill, M.A. (2024, April 25) Embryology Spaulding-fig20.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Spaulding-fig20.jpg

What Links Here?

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