口球（口块） buccal mass，buccal bulb

互联网2013-11-14

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除瓣鳃纲外的软体动物，其消化管的前端膨出部分称为口球或口块。前端开口于外界，后端与食管相连。其内有齿舌、齿舌突起和颚板，并附有齿舌囊。唾液腺开口于此。

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