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sinoatrial node

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Sino atrial nodes
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si⋅no⋅a⋅tri⋅al node

  [sahy-noh-ey-tree-uhl, sahy-]
Use sinoatrial node in a Sentence
–noun Anatomy.
a small mass of tissue in the right atrium functioning as pacemaker of the heart by giving rise to the electric impulses that initiate heart contractions.
Also called sinus node.

Origin:
1920–25; sino- + atrial
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Sino atrial nodes
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www.RightHealth.com/HeartProblems
sinoatrial node  
n.  A small mass of specialized cardiac muscle fibers located in the posterior wall of the right atrium of the heart that acts as a pacemaker by generating at regular intervals the electric impulses of the heartbeat. Also called sinoauricular node, sinus node.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Medical Dictionary

Main Entry: sinoatrial node
Function: noun
: a small mass of tissue that is made up of Purkinje fibers, ganglion cells, and nerve fibers, that is embedded in themusculature of the right atrium of higher vertebrates, and that originates the impulses stimulating the heartbeat called also S-A node, sinus node
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

sinoatrial node n.
Abbr. SAN
A small mass of specialized cardiac muscle fibers located in the posterior wall of the right atrium of the heart that acts as a pacemaker of the cardiac conduction system by generating at regular intervals the electric impulses of the heartbeat. Also called sinoauricular node, sinus node.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Science Dictionary
sinoatrial node   (sī'nō-ā'trē-əl)  Pronunciation Key 
A small mass of specialized cardiac muscle fibers that acts as a pacemaker by initiating and maintaining normal heartbeat and cardiac rhythm. It is located in the right atrium.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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