Coronary circulation | Anatomy2Medicine
Coronary circulation

Coronary circulation

    • Coronary Arteries
      • Arise from the ascending aorta
      • filled with blood during the ventricular diastole.
      • Have maximal blood flow during diastole
      • minimal blood flow during systole because of compression of the arterial branches in the myocardium during systole.
      • Right Coronary Artery
        • Arises from the anterior (right) aortic sinus of the ascending aorta
        • runs between the root of the pulmonary trunk and the right auricle,
        • descends in the right coronary sulcus,
        • generally supplies the right atrium and ventricle.
        • Branches
          • SA Nodal Artery
            • supplies the SA node and the right atrium.
          • Marginal Artery
            • supplies the inferior margin of the right ventricle.
          • Posterior IV (Posterior Descending) Artery
            • supplies a part of the IV septum and left ventricle and the AV node.
          • AV Nodal Artery
            • supplies the AV node.
      • Left Coronary Artery
        • Arises from the left aortic sinus of the ascending aorta, just above the aortic semilunar valve.
        • is shorter than the right coronary artery

 

  • usually is distributed to more of the myocardium.

 

      • Branches
        • Anterior IV (Left Anterior Descending) Artery
        • chief source of blood to the IV septum and the apex.
    • Circumflex Artery
      • Runs in the coronary sulcus
      • gives off the left marginal artery
      • supplies the left atrium and left ventricle
      • anastomoses with the terminal branch of the right coronary artery.

 

    • Cardiac Veins and Coronary Sinus
      • Coronary Sinus
        • Is the largest vein draining the heart
        • lies in the coronary sulcus, which separates the atria from the ventricles.

 

  • Opens into the right atrium between the opening of the IVC and the AV opening.

 

        • Has a one-cusp valve at the right margin of its aperture.
        • Receives the

 

  • great, middle, and small cardiac veins

 

          • the oblique vein of the left atrium
          • posterior vein of the left ventricle.
          • Great Cardiac Vein
        • Begins at the apex of the heart
        • ascends along with the IV branch of the left coronary artery.
        • Turns to the left to lie in the coronary sulcus and continues as the coronary sinus.
          • Middle Cardiac Vein
        • Begins at the apex of the heart
        • ascends in the posterior IV groove,

 

  • accompany the posterior IV branch of the right coronary artery.
  • Drains into the right end of the coronary sinus.

 

          • Small Cardiac Vein
        • Runs in company with the marginal artery
        • end in the right end of the coronary sinus.
          • Oblique Vein of the Left Atrium

 

  • Descends to empty into the coronary sinus, near its left end

 

        • Anterior Cardiac Vein
      • Drains the anterior right ventricle
      • ends directly in the right atrium.
        • Smallest Cardiac Veins (Venae Cordis Minimae)
      • Begin in the wall of the heart and empty directly into its chambers.