心囊 cardiacvesicle, cadiac sac, perica-rdial membrane
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心囊 cardiacvesicle, cadiac sac, perica-rdial membrane ( 1)亦称心泡。柱头虫类的背血管前端进入吻内的部分,即紧靠着中央窦背壁的小囊。腹壁为肌肉组织,作节律性的收缩,由收缩压力使血管内的血液流动。一般认为是幼虫心脏的残存结构,但它不和血管系直接通连。
( 2) =围心腔。
互联网
心囊 cardiacvesicle, cadiac sac, perica-rdial membrane ( 1)亦称心泡。柱头虫类的背血管前端进入吻内的部分,即紧靠着中央窦背壁的小囊。腹壁为肌肉组织,作节律性的收缩,由收缩压力使血管内的血液流动。一般认为是幼虫心脏的残存结构,但它不和血管系直接通连。
( 2) =围心腔。
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