昆虫的心脏和大动脉合并的名称。
后胸辅搏动器很小，与背血管无直接通道，具有一个没有肌肉的搏动膜。
The metathoracic accessory pulsatory organ is very small and has no direct channels connecting the dorsal vessel, but there is a pulsating membrane without muscle.
二种环节动物皆具有闭锁循环系，包括管状的心脏及背血管，腹血管。用大头针标示二标本的下列构造：。
Both annelids possess a closed circulatory system with tubular hearts and a dorsal and ventral blood vessel. In both specimens, pin the following.
背阔肌的主要供养血管是胸背动、静脉。
The latissimus dorsi muscle was mainly supplied by thoracodorsal.
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