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Sinoatrial node

Synonym(s)

  • cardiac pacemaker
  • Koch's node
  • node of Keith and Flack
  • SA node
  • sino-atrial node
  • sinuatrial node
  • sinus node

Definition(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 DictionaryThis link leads to a site outside Genetics Home Reference. by Merriam-Webster Inc.

See also Understanding Medical Terminology.

 
Published: October 20, 2014