Abstract
The anatomy of an auxiliary heart found in many decapod crustaceans is described. This heart is found at the anterior end of the dorsal median artery before the artery divides to supply the cerebral nervous system. The heart is essentially 2 strips of modified somatic muscle located inside a sinus in the dorsal median artery. The muscles are innervated by 4 motoneurons located in the supraesophageal ganglion. Sensory innervation and possible neurosecretory elements are described.

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