sphincter muscle of bile duct.
胆道括约肌
Anatomical study of the palatopharyngeal sphincter muscle
腭咽括约肌的解剖学研究
A ring of muscle, the cardiac sphincter, surrounds the esophagus at this point.
此处有一肌肉环即贲门括约肌围绕着食道。
The Feasibility Study of Reconstruction of External Urethral Sphincter Using Pyramidal Muscle.
锥状肌替代尿道外括约肌的可行性研究
At the lower end of the esophagus is a small ring of muscle called the lower esophageal sphincter.
在食管的末端有一个较小的环形肌肉叫做下食管括约肌。
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