...: first, of a muscle originating from the muscle system of both ureters and converging to form within the bladder the interureteric ridge, the musculus interuretericus and of a second structure forming the actual trigonum vesicae. It is the musculus sphincter trigonalis or musculus sphincter vesicae...

... consequences. The lower part is closely combined with the lumen of the urethra. During contraction the muscle could be able to open the musculus sphincter trigonalis and the musculus sphincter urethrae; we called them musculus dilator urethra. Summarizing all presented histomorphological results of parts 1–4...