Tom Wade MD

Today, I link to some of the website results of my Google Search: Normal Coronary Artery Anatomy.

See also Normal Coronary Artery Anatomy: Images.

And finally, review StatPearls‘ Physiology, Coronary Circulation. Saad Rehman; Amir Khan; Afzal Rehman. Last Update: May 1, 2023.

What follows are  the AI results of the above webpage. Visit the page for links to other websites relevant to normal coronary artery anatomy.

The normal configuration of the human coronary circulation typically consists of two main coronary arteries—the Left Main Coronary Artery (LMCA) and the Right Coronary Artery (RCA). These vessels originate from the aortic sinuses (sinuses of Valsalva) located at the root of the ascending aorta, just superior to the aortic valve. They form a specialized arterial network responsible for delivering oxygenated blood directly to the myocardium. [1, 2, 3, 4, 5]

Left Main Coronary Artery (LMCA)

The LMCA arises from the left aortic sinus. It has a short common stem before rapidly bifurcating into two primary branches: [1, 2, 3]

• Left Anterior Descending Artery (LAD): Often called the “widowmaker” due to the critical nature of its blockages. It runs down the anterior interventricular groove toward the apex. It supplies the anterior wall of the left ventricle and the anterior two-thirds of the interventricular septum via its diagonal and septal perforator branches. [1, 2, 3, 4, 5]
• Left Circumflex Artery (LCx): Travels along the left atrioventricular groove, curving around the lateral margin toward the back of the heart. It gives off obtuse marginal (OM) branches to supply the lateral and posterior walls of the left ventricle. [1, 2, 3, 4]
• Note: In roughly 15–20% of individuals, the LMCA trifurcates, giving rise to a third branch called the ramus intermedius, which courses between the LAD and LCx. [1, 2]

Right Coronary Artery (RCA)

The RCA originates from the right aortic sinus and descends within the right atrioventricular groove. It primarily supplies the right atrium, the right ventricle, and crucial parts of the electrical conduction system. Its key branches include: [1, 2, 3, 4, 5]

• Conus Artery: The first branch of the RCA, which supplies the right ventricular outflow tract.
• Sinoatrial (SA) Nodal Artery: Arises from the proximal RCA in roughly 60% of individuals to supply the SA pacemaker node.
• Acute Marginal Branches: Course along the inferior margin of the heart to supply the anterior and lateral walls of the right ventricle.
• Atrioventricular (AV) Nodal Artery: Arises near the crux of the heart to supply the AV node. [1, 2, 3, 4, 5]

Understanding Coronary Dominance

Coronary dominance is clinically determined by which of the two main arteries gives rise to the Posterior Descending Artery (PDA). The PDA travels along the posterior interventricular groove to supply the inferior wall of the heart and the posterior third of the septum. [1, 2, 3]

• Right Dominance (~70–85%): The PDA and posterolateral branches originate from the RCA.
• Left Dominance (~10%): The PDA originates entirely from the LCx branch of the left system.
• Co-dominance (~10–15%): Both the RCA and the LCx contribute branches that supply the posterior interventricular groove. [1, 2, 3, 4]

Would you like to explore benign anatomical variations (such as myocardial bridging) or look into the anatomy of coronary venous drainage next?

This is for informational purposes only. For medical advice or diagnosis, consult a professional. AI responses may include mistakes. Learn more