(1)肛門の括約筋
(2)the sphincter muscle of the anus
さらに詳しく
(1)膀胱の括約筋
(2)尿道口の周りの膀胱の厚い筋肉層から成る
(3)the sphincter muscle of the urinary bladder; made up of a thickened muscular layer of bladder around the urethral opening
