The AV bundle branch is supplied by the RCA (10% of cases), the LCA (73%), or both (17%). The right bundle branch (running through the moderator band) is supplied primarily by septal branches of the LAD. The left bundle branch is supplied by branches from both the RCA and LAD. *Note: some board-review sources use simplified conduction-artery figures (SA nodal artery: RCA ~60%/LCx ~40%; AV nodal artery: RCA ~80-90%) rather than the granular bundle-branch breakdown above.*
Related RCIS terms
Study RCIS terms in context
Cardiac Codex turns definitions like this into a full study system: 177 lessons, 2,233 practice questions with explanations, blueprint-matched mock exams, and Cardiac Coach — an AI tutor grounded in this exact glossary you can ask from any lesson.
Get early access Back to the glossary →
Cardiac Codex is an independent study tool published by MdoubleA LLC, not affiliated with or endorsed by CCI or any certifying body. This glossary entry is exam-preparation information, not medical advice or a substitute for clinical judgment. Always verify current clinical practice against primary sources and institutional protocol.