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单词 External anal sphincter
释义

External anal sphincter

原声例句
Osmosis-解剖与生理

Meanwhile, signals are sent to the brainstem and thalamus, and when these decide the right moment has come, they allow the external anal sphincter to relax - and feces goes, hopefully, into the toilet bowl.

直肠发出的信号同时也发送到了脑干和丘脑;当它们认定“时机成熟”时,便会下达指令使肛门外括约肌松弛;粪便就能——不出意外的话——顺利排入马桶。

英语百科

External anal sphincter

The external anal sphincter (or sphincter ani externus ) is a flat plane of muscular fibers, elliptical in shape and intimately adherent to the skin surrounding the margin of the anus.

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