internal sphincter
肛门内括约肌 [解剖] musculus sphincter ani internus
内镜下括约肌切开术 endoscopic sphincterotomy ; EST
海豚没有声带，但却能发声：一个由口哨声、吱吱声、呻吟声、颤音和咔嚓声组成的复杂系统是由喷水孔内的括约肌产生的。
Dolphins lack vocal cords, nevertheless creating sounds: a complicated system of whistles, squeaks, moans, trills, and clicks are produced by sphincter muscles inside the blowhole.
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