Sphincter ani internus muscle

英 美
  • 肛门内括约肌
  • ani n.美洲黑杜鹃abbr.自动号码识别(=automaticnumberidentification)
  • internus 眼内直肌
  • muscle n.肌肉v.硬挤;变硬实
  • sphincter n.括约肌