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Wiktionary
cardiac plexus

n. A plexus of nerves situated at the base of the heart that innervate the heart.

WordNet
cardiac plexus

n. a plexus of nerves supplying the heart and nearby structures [syn: plexus cardiacus]

Wikipedia
Cardiac plexus

The cardiac plexus is a plexus of nerves situated at the base of the heart that innervates the heart.