Figure 2. Urethra or urinary passage opened lengthwise in the front Part, from de Graff (1672). Reprinted with permission of the New York Academy of Medicine. A. The urinary bladder; B. The neck of the bladder; C. The urethra opened lengthwise; D. The orifice of the urethra and exits of the lacunae in it; E. The lacunae traversing the "prostatae"; F. The lacunae taken from the "prostatae" and distended by air; G. The internal substance of the "prostatae," or glandulous body; H. The parts of the bladder drawn apart after division; 1. The ureters cut; K. The labia of the pudendum; L. The orifice of the vagina; M. The fleshy fibres of the sphincter cut. Legend reprinted by permission of the Journal of Reproduction and Fertility. [From Heath, 1984]