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give me arterial blood supply of heart Peer proper diagram and flashcard

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arterial blood supply of heart coronary arteries anatomy diagram

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Medical flashcard titled "Arterial Blood Supply of the Heart" with two sections: FRONT shows a clean labeled diagram of the heart's anterior view with the following arteries clearly marked: Right Coronary Artery (RCA) in the right atrioventricular groove, Left Coronary Artery (LCA) originating from left aortic sinus, Left Anterior Descending (LAD) artery in the anterior interventricular sulcus, Left Circumflex Artery (LCx) in the left AV groove, Right Marginal Artery, Left Marginal Artery, Posterior Interventricular Artery (from RCA). BACK section lists key supply areas in bullet points: RCA - right atrium, right ventricle, SA node (55%), AV node (80%), posterior 1/3 IVS; LAD - anterior 2/3 IVS, anterior LV, anterior RV; LCx - left atrium, posterior LV, SA node (45%). Include a "Dominance" note: Right dominant 67%, Left dominant 15%, Co-dominant 18%. Use a professional anatomy textbook style with clean white background, color-coded arteries (red for RCA, blue for LAD, green for LCx).

Here is a complete, well-sourced breakdown of the arterial blood supply of the heart, with diagrams and a flashcard.

Arterial Blood Supply of the Heart

Diagrams

Anterior view - Color-coded supply territories (from Fischer's Mastery of Surgery):
Coronary artery distribution - anterior and cross-sectional views
Red = Myocardium supplied by RCA | Orange = Myocardium supplied by LCA. Panels A-D show the 4 main dominance patterns.
Labeled arterial territories - color-coded by vessel (TeachMeAnatomy):
Blood supply of the heart - anterior view with labeled arteries

Flashcard

Arterial Blood Supply of the Heart - Flashcard

Full Explanation

Overview

The heart receives its arterial supply from two coronary arteries - the Right Coronary Artery (RCA) and the Left Coronary Artery (LCA) - both arising from the ascending aorta, just above the aortic valve cusps (from the right and left aortic sinuses respectively).

1. Right Coronary Artery (RCA)

Origin: Right aortic sinus of the ascending aorta
Course: Descends vertically in the coronary sulcus (atrioventricular groove) between the right atrium and right ventricle, travels to the inferior margin, then turns posteriorly onto the diaphragmatic surface.
Branches:
BranchLocationSupply
Sinu-atrial (SA) nodal branchPasses around the superior vena cavaSA node (in ~55% of people)
Right marginal arteryAlong the inferior (acute) marginRight ventricle, apex
AV nodal branchNear the crux of the heartAV node (in ~80% of people)
Posterior interventricular (PDA)Posterior interventricular sulcusPosterior IVS, posterior LV
Total territory supplied by RCA:
  • Right atrium
  • Right ventricle
  • SA node (55%), AV node (80%)
  • Interatrial septum
  • Posterior 1/3 of interventricular septum (IVS)
  • Portion of the posterior left ventricle

2. Left Coronary Artery (LCA)

Origin: Left aortic sinus of the ascending aorta
Course: Passes between the pulmonary trunk and left auricle, enters the coronary sulcus, then quickly bifurcates (occasionally trifurcates in ~15% - giving a ramus intermedius) into:

a) Left Anterior Descending (LAD) - Anterior Interventricular Branch

  • Descends in the anterior interventricular sulcus toward the apex
  • Curves around the apex to anastomose with the posterior interventricular branch (PDA)
  • May give off diagonal branches across the anterior LV surface
  • Supplies: Anterior left ventricle, anterior right ventricle, anterior 2/3 of IVS (including the bundle of His and bundle branches)
  • Called "the artery of sudden death" - most commonly blocked in MI

b) Left Circumflex Artery (LCx)

  • Courses in the coronary sulcus around the left border of the heart
  • Gives off the left marginal artery (obtuse marginal)
  • Usually terminates before the posterior interventricular sulcus (in right-dominant hearts)
  • Supplies: Left atrium, posterior/lateral left ventricle, SA node (in ~45% of people)

Coronary Dominance

Dominance is defined by which artery gives off the Posterior Descending Artery (PDA):
TypeFrequencyPDA from
Right dominant~67%RCA
Left dominant~15%LCx
Co-dominant~18%Both RCA and LCx

Clinically Important Notes

VesselArea at Risk in OcclusionECG Changes
LAD (proximal)Anterior LV, IVS, bundle branchesAnterior ST elevation (V1-V4), LBBB
RCA (proximal)Inferior LV, RV, SA/AV nodesInferior ST elevation (II, III, aVF), bradyarrhythmias
LCxLateral/posterior LVLateral ST elevation (I, aVL, V5-V6)
Sources: Gray's Anatomy for Students, p. 238; Fischer's Mastery of Surgery 8th ed., p. 7364; TeachMeAnatomy - Blood Supply of the Heart; Radiopaedia - Coronary Arteries
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