The Coronary Arteries PDF

Dr.Ahmed Abdulhussain  Arise from aortic sinuses in its beginning. They circle the heart in the coronary sulcus.  Originates from right aortic sinus. Emerges between right auricle and pulmonary trunk and descends vertically in c...

Dr.Ahmed Abdulhussain  Arise from aortic sinuses in its beginning. They circle the heart in the coronary sulcus.  Originates from right aortic sinus. Emerges between right auricle and pulmonary trunk and descends vertically in coronary sulcus. Then passes along inferior surface of the heart to run posteriorly. 1) SA nodal 2) L. Atrial 3) R. Conus 4) R. marginal 5) AV nodal 6) Post. I.V.  Originates from left aortic sinus. Passes between aortic trunk and left auricle then enters the coronary sulcus. 1) Ant. I.V. : gives left conus, diagonal and septal branches. 2) Circumflex: give Left marginal branch.  These are common In about half the cases the right coronary artery is dominant i.e., the posterior interventricular artery is derived from the right coronary artery 50%  In about 20% of cases, the left coronary artery is dominant i.e., the posterior interventricular artery is derived from the left coronary artery 20% In about 30% of cases, the coronary arterial pattern is balanced in which case branches of both right and left coronary arteries run in or near the interventricular sulcus 30%  The veins of the heart follow, more or less, the pattern of the arteries but unfortunately the names are different.  Is the main vein of the heart Is wide and short Lies in the posterior part of the atrioventricular groove Opens at the right (i.e. lower) end of the atrioventricular groove into the posterior wall of the right atrium  the great cardiac vein opens at its left the middle and small cardiac veins open at its right end  The coronary sinus drains all the venous blood from the heart except that carried by the anterior cardiac veins and the venae cordis minimae that open directly into the heart  The coronary sinus opens into the right atrium, immediately to the left of the inferior vena cava and posterior to the right atrioventricular orifice IVC  Begins at the apex of the heart and ascends in the anterior interventricular groove (in company with the anterior interventricular artery) At the coronary sulcus it enters the left end of the coronary sinus drains the area of the heart supplied by the LCA  Begins at the apex of the heart and ascends in the posterior interventricular groove in company with the posterior interventricular artery Enters the right side of the coronary sinus  Accompanies the marginal branch of the right coronary artery Runs in the coronary groove to enter the coronary sinus to the right of the middle cardiac vein. The middle and small cardiac veins drain most of the area of the heart supplied by the RCA  Lies on the diaphragmatic surface of the left ventricle a little left of the middle cardiac vein Opens into the middle of the coronary sinus or the great cardiac vein  2-4 small veins that run over the anterior surface of the right ventricle cross over the coronary groove to open directly into the right atrium end separately or in variable combinations.  A group of smallest cardiac veins (venae cordis minimae or veins of Thebesius) have also been described. Draining directly into the cardiac chambers, they are numerous in the right atrium and right ventricle, are occasionally associated with the left atrium, and are rarely associated with the left ventricle. ANY QUESTION ???