Oelrich T M
Anat Rec. 1983 Feb;205(2):223-32. doi: 10.1002/ar.1092050213.
Striated muscle associated with the female urethra and vagina constitute a continuous mass which appropriately may be called the urogenital sphincter. Though continuous, the muscle may be separated into two parts--one that surrounds the urethra, and the other surrounding the urethra and vagina. The individual muscle fibers are small and are embedded in connective tissue and infiltrated with smooth muscle which obscures the visibility of the muscle to gross dissection. Developmentally the muscle primordium is laid down around the urogenital sinus and urethra early, and foreshadows the anatomical arrangement that is maintained in the adult with little change. The urogenital sphincter muscle extends from the base of the bladder where it lies within the pelvic cavity and continues through the urogenital hiatus of the pelvic diaphragm to expand around the vagina in the perineum. Additional fibers attach to the ischiopubic rami and constitute a compressor of the urethra. As a result there is no superior fascia of the so-called "urogenital diaphragm" which closes off a deep perineal compartment or forms a floor of the urogenital hiatus.
与女性尿道和阴道相关的横纹肌构成一个连续的肌群，可恰当地称为泌尿生殖括约肌。尽管该肌肉是连续的，但可分为两部分——一部分围绕尿道，另一部分围绕尿道和阴道。单个肌纤维细小，嵌入结缔组织中，并混有平滑肌，这使得在大体解剖时难以看清该肌肉。在发育过程中，肌原基很早就围绕泌尿生殖窦和尿道形成，预示着在成人中基本保持不变的解剖结构。泌尿生殖括约肌从位于盆腔内的膀胱底部延伸，穿过盆膈的泌尿生殖裂孔，在会阴处围绕阴道扩展。另外的纤维附着于耻骨坐骨支，构成尿道的压迫肌。因此，不存在所谓“泌尿生殖膈”的上筋膜来封闭深会阴间隙或形成泌尿生殖裂孔的底部。
