Ayoub S F
J Anat. 1979 May;128(Pt 3):571-80.
The anatomy of the anterior portion of the levator ani muscle in studied in 26 adult human cadavers of both sexes. This portion of the muscle is found to consist of three layers of muscle fibres. The three layers are: 1. The pelvic layer. Its fibres (1) are attached to the capsule of the prostate or adventitia of the lateral wall of vagina, (2) intermingle with and supplement the longitudinal muscle layer of the anal canal, and (3) are continuous with the fibres of the opposite side behind the recto-anal junction. 2. The middle layer. The most anterior fibres are twisted on themselves to form the round free border of the muscle that bounds the levator hiatus. The majority of the muscle fibres of this layer proceed backwards to cover and blend with the deep part of the external anal shincter, partly joining the anococcygeal ligament. 3. The perineal layer. These fibres surround the superficial part of the external anal sphincter. A respectable bundle of muscles fibres unites with that of the opposite side in from of the lower part of the anal canal. Remaining fibres terminate in perianal skin or anococcygeal ligament. The role of the anterior portion of the levator ani in fixation and prevention of prolapse of the pelvic viscera is stressed.
对26具成年男女尸体的肛提肌前部进行了解剖学研究。发现该部分肌肉由三层肌纤维组成。这三层分别是：1. 盆层。其纤维（1）附着于前列腺包膜或阴道侧壁外膜，（2）与肛管纵肌层交织并补充该层，（3）在直肠肛管交界处后方与对侧纤维相连。2. 中层。最前部的纤维自身扭转形成界定提肌裂孔的肌肉圆形游离缘。该层的大多数肌纤维向后走行，覆盖并与肛门外括约肌深部融合，部分纤维与肛尾韧带相连。3. 会阴层。这些纤维围绕肛门外括约肌浅部。一束可观的肌纤维在肛管下部前方与对侧纤维相连。其余纤维止于肛周皮肤或肛尾韧带。强调了肛提肌前部在固定盆腔脏器和防止其脱垂方面的作用。
