髂尾肌

qià wěi jī zhǔ yào chéng dān zhī chí gōng néng ér chǐ gǔ zhí cháng jī jù yǒu kuò yuē jī gōng néng

髂尾肌主要承担支持功能，而耻骨直肠肌具有括约肌功能。

The iliococcygeus has a mainly supportive function, whereas the puborectalis has a sphincteric function.