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Sinoatrial node

Synonym(s)

A small mass of tissue that is made up of Purkinje fibers, ganglion cells, and nerve fibers, that is embedded in the musculature of the right atrium of higher vertebrates, and that originates the impulses stimulating the heartbeat--called also S-A node, sinus node.: Definition from: Merriam-Webster's Medical Dictionary by Merriam-Webster Inc.


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