cardiac sphincter,

双峰驼消化系统(三)
【预订】perineal and anal sphincter trauma: diagnosis and
肛门外括约肌 sphincter ani externus 27.肛管 anal canal 28.
不同胃区中带有苦味受体t2r126的不同细胞类型
肛门外括约肌深部deep part of sphincter ani externus 4.