Leiden - Drawing Differentiation of male and female external genitalia - no labels

Differentiation of male and female external genitalia. The upper images depict the indifferent stage of the external genitalia in the 6th, 7th, and 9th week of embryonic development. In this stage, a separate anal orifice and urogenital orifice are formed. In the middle two images, the situation around the 10th week is drawn - the genitalia start to develop to either male with the forming of an early penis or female. Furthermore, the anus is formed and detached from the urethral groove by the perineum. The two lower left images show the differentiation of the male external genitalia in the 12th and 14th week, with the closing of the urethral groove and forming of scrotum and urinary meatus. The two lower right images show the differentiation of the female external genitalia in these weeks, characterized by the forming of the mons pubis, labia minora and majora, and later the clitoris, external urethral orifice and hymen. Version without labels.

Also published in Textbook of Obstetrics and Gynaecology, E.A.P. Stegers et al, 2019, BSL, https://doi.org/10.1007/978-90-368-2131-5, ISBN 978-90-368-2130-8