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 ?
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.