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Figs. 11-13. Sagittal sections through the hymen (Embryo 4). The dotted 

 line is drawn at the level of the entrance of the vagina into the urogenital 

 sinus. It is to the left of this that the hymen is formed. Fig. 11 (Section 

 No. Gl) strikes about the centre of the hymen, so that it appears as folds 

 from above and below that do not meet (hymeneal orifice). To the right 

 of it lies a high, narrow fold, rising from below, lined on the left ( anterior ) 

 side by vaginal, on the right (posterior) side by sinus epithelium. In Fig. 12 

 (Section No. 63) the exact position of this fold and its relations can be better 

 seen. The hymen can be clearly recognized to the left of it as a connective 

 tissue membrane lined on both sides by vaginal epithelium. This is the 

 most convincing pictiu-e in the series. Fig. 13 is taken lateral to this (Section 

 No. 67). Only a teat-like remnant of the vulvo-vaginal fold can be seen 

 below and to the right. The hymen is seen as a thick band. Papillte appear 

 on the posterior side. Magnified 45 X. 



