Dorschner W, Stolzenburg J U, Dieterich F
Department of Urology, Leipzig University, FRG.
Urol Int. 1994;52(3):154-8. doi: 10.1159/000282596.
Results of a histomorphological study of serial sections carried out in frontal, transversal and sagittal directions in 65 bladder necks are presented. It is shown that the trigonal system of the urinary bladder consists of two anatomical structures: 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. This muscle elliptically embraces the internal urethral orifice and is only formed by one muscle lamella. It does not as has often been described extend in any form to the urethra or to the surroundings. The so-called Bell muscle does not exist. During the reproductive years the lower part of the sphincter trigonalis is strongly pervaded with prostate tissue. This could enable the muscle to have a double function: a continence function in accordance with a consequent distinction between the urinary bladder and the urethra as urinary and sexual tract, and during ejaculation the muscle could prevent the retrograde ejaculation and on the other hand the contraction of the muscle could lead to the release of the prostate secretion.
本文展示了对65个膀胱颈进行额状、横断和矢状方向连续切片的组织形态学研究结果。结果表明，膀胱三角系统由两个解剖结构组成：其一，是起源于双侧输尿管肌肉系统并在膀胱内汇聚形成输尿管间嵴、输尿管间肌的肌肉；其二，是形成实际膀胱三角的第二个结构，即三角括约肌或膀胱括约肌。该肌肉呈椭圆形包绕尿道内口，仅由一层肌片构成。它并不像经常描述的那样以任何形式延伸至尿道或其周围。所谓的贝尔肌并不存在。在生殖年龄段，三角括约肌下部被前列腺组织大量浸润。这可能使该肌肉具有双重功能：根据膀胱和尿道作为泌尿生殖道和性器官的明确区分，发挥控尿功能；在射精时，该肌肉可防止逆行射精，另一方面，其收缩可促使前列腺分泌。
