口腕oral arm

互联网2013-11-14

502

　　钵水母类的口的四角（相当于正对称面）延长所呈的腕状物。与水螅水母短的口唇（ oral lip）相对应。水水母等旗口水母类有 4条，蛸水母类的根口水母类有 8条。口腕的切面呈∧形，内侧（口侧）凹陷的底部称腕沟，密生纤毛，纤毛摆动引起水流，将食物送向口的一方。

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