sinuatrial (S-A) nodal branch of right coronary artery

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sinuatrial (S-A) nodal branch of right coronary artery

[TA]
ascending atrial branch, usually (55%) arising from the anterior stem of the right coronary artery (but 35-45% arising from the circumflex branch of the left coronary artery), which runs around the base of the superior vena cava to reach the sinuatrial node.
References in periodicals archive ?
Anatomical variations in the human sinuatrial nodal artery.
Sinuatrial nodal artery (SAN) arose from the RCA in 70 per cent and from the circumflex artery (CX) in 30 per cent of instances.
Sinuatrial nodal artery (SAN): In 21 (70%) hearts the SAN artery arose as the first branch from its right side at a mean distance of 20 mm distal to the origin of the RCA (Fig.