墨囊 ink-sac
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为头足类的乌贼，章鱼所特有的结构，是贮藏墨汁的梨形囊。墨囊只 1个，位于外套腔顶端附近正中线上，其中贮有小型墨腺的分泌物，必要时，分必物经墨管（ ink-duct）在肛门附近与从外套腔排出的水一起从漏斗排放到外界。在墨管的经路中有两处具有括约肌。
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