Hussain S M, Stoker J, Laméris J S
Department of Radiology, University Hospital Rotterdam, The Netherlands.
Radiology. 1995 Dec;197(3):671-7. doi: 10.1148/radiology.197.3.7480737.
To determine the normal anatomy of the anal sphincter complex on magnetic resonance (MR) images.
Ten healthy volunteers (four men, six women; age range, 21-26 years) underwent MR imaging with an endoanal coil.
The lower part of the anal canal contained the internal sphincter, the longitudinal muscle layer, and the external sphincter; the upper part comprised the internal sphincter, the longitudinal layer, and the puborectal muscle. At the upper end, the puborectal muscle was attached to the levator ani muscle. Anteriorly, the external sphincter was connected to the urogenital diaphragm; posteriorly, it was attached to the coccyx with the anococcygeal ligament. All perianal spaces were visible. The morphology of the anterior part of the external sphincter, different in men and women, was well displayed.
Depiction of the anal sphincter complex on MR images is excellent.
确定肛门括约肌复合体在磁共振（MR）图像上的正常解剖结构。
10名健康志愿者（4名男性，6名女性；年龄范围21 - 26岁）使用肛管线圈进行MR成像。
肛管下部包含内括约肌、纵肌层和外括约肌；上部包括内括约肌、纵肌层和耻骨直肠肌。在其上端，耻骨直肠肌附着于肛提肌。在前方，外括约肌与尿生殖膈相连；在后方，它通过肛门尾骨韧带附着于尾骨。所有肛周间隙均可见。外括约肌前部的形态在男性和女性中不同，显示良好。
MR图像对肛门括约肌复合体的显示极佳。
