Arterial blood supply of the human sinus node.

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Abstract
The arterial blood supply of the human sinus node was studied by correlating post-mortem coronary angiograms with histological sections. The method enables Identification of all coronary arteries and larger arterioles in relation to the specific conductive tissue. A fairly uniform pattern of arterial distribution Is described. The arterial density, estimated by planlmetric measurements of the arterial lumina, was found to be approximately 8 times greater within the sinus node than In the adjacent free atrlal wall. The possible functional significance of these anatomical findings Is briefly discussed.