Sinoatrial Node

The sinoatrial node (also commonly spelled sinuatrial node, abbreviated SA node or SAN, also called the sinus node) is the impulse-generating (pacemaker) tissue located in the right atrium of the heart, and thus the generator of normal sinus rhythm. It is a group of cells positioned on the wall of the right atrium, near the entrance of the superior vena cava. These cells are specialized cardiomyocytes. Though they possess some contractile filaments, they do not contract robustly.

The SAN was first described in 1907 by Arthur Keith and Martin Flack.

Read more about Sinoatrial NodeRole As A Pacemaker, Histology, Innervation, Blood Supply, Sinus Node Dysfunction, Additional Images

Other articles related to "sinoatrial, sinoatrial node, node":

Sinoatrial Arrest
... Sinoatrial arrest (also known as sinus arrest or sinus pause) is a medical condition wherein the sinoatrial node of the heart transiently ceases to generate ... (ECG) as a brief period of irregular length with no electrical activity before either the sinoatrial node resumes normal pacing, or another pacemaker begins pacing ... If a pacemaker other than the sinoatrial node is pacing the heart, this condition is known as an escape rhythm ...
Neural Oscillation - Function - Pacemaker
... Cells in the sinoatrial node, located in the right atrium of the heart, spontaneously depolarize approximately 100 times per minute ... potentials that trigger cardiac contraction, the sinoatrial node normally initiates it, simply because it generates impulses slightly faster than the other areas ... In the absence of extrinsic neural and hormonal control, cells in the SA node will rhythmically discharge ...
Ventricular Escape Beat - Causes
... normally initiated by the heart's sinoatrial node (SA node), transmitted to the atrioventricular node (AV node), and then further transmitted to the ventricles) falls below the base rate ... has failed to reach the ventricles This phenomenon can be caused by the sinoatrial node (SA node) failing to initiate a beat, by a failure of the conductivity from the SA node to the ... Normally, the pacemaker cells of the sinoatrial node discharge at the highest frequency and are thus dominant over other cells with pacemaker activity ...