Dictionary

sinoatrial node

noun

Definition of SINOATRIAL NODE

First Known Use of SINOATRIAL NODE

1913

sinoatrial node

noun    (Medical Dictionary)

Medical Definition of SINOATRIAL NODE

:  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

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