Hamada T
Department of Urology, Nihon University School of Medicine.
Nihon Hinyokika Gakkai Zasshi. 1993 Feb;84(2):258-64. doi: 10.5980/jpnjurol1989.84.258.
For investigation of function of the male posterior urethra, morphological study was performed in terms of the muscle architecture including sphincter muscle of the posterior urethra. The muscle localization was demonstrated by microdissection in eight male cadavers. Histological examination was also employed with HE staining and immunohistochemical method to detect the nature of these muscles. At the dorsal side, the muscle fibers of the deep trigone were located from the inter-ureteral ridge beyond the bladder neck to the vermontanum surrounding the posterior urethra. They were regarded as the internal urethral sphincter muscles. At the ventral side, the muscle fibers were also found just outside the ventral prostate running from the base to the apex of the prostate. Then, they were circularly located around the membranous urethra. These saddle shaped muscles were proved to be striated muscle by the immunohistochemical examination using anti-Desmin and anti-Myoglobin antibody. Therefore, the external urethral sphincter muscle would consist of the pelvic floor muscles and the urethral sphincter muscles.
为研究男性后尿道的功能，我们从包括后尿道括约肌在内的肌肉结构方面进行了形态学研究。通过对8具男性尸体进行显微解剖来显示肌肉定位。还采用苏木精-伊红（HE）染色和免疫组织化学方法进行组织学检查，以检测这些肌肉的性质。在背侧，深部三角区的肌纤维从输尿管间嵴延伸至膀胱颈后方，直至围绕后尿道的精阜。它们被视为尿道内括约肌。在腹侧，也发现肌纤维位于前列腺腹侧表面外侧，从前列腺底部延伸至顶部。然后，它们呈环形围绕膜性尿道。使用抗结蛋白和抗肌红蛋白抗体的免疫组织化学检查证明，这些鞍形肌肉为横纹肌。因此，尿道外括约肌将由盆底肌和尿道括约肌组成。
