The puborectal muscle is not a single muscle ansa, and the tractive functions of different parts of the muscle act on the anal canal, which is related to the formation and maintenance of anterior and posterior horns of the anal canal.

• 耻骨直肠肌并非单一肌袢 ,其会阴体部、肌袢部及联合纵肌部共同牵拉作用于肛管 ,分别与肛管直肠前、后角的形成和维持有关。