Coronary Circulation

Question 1

Left Coronary Artery

Answer 1

Originates from the ascending aorta posterior to the pulmonary trunk. Bifurcates into two branches: the anterior interventricular branch (left anterior descending LAD) travels in the anterior interventricular sulcus and supplies mainly the LV. The circumflex branch travels in the coronary sulcus on the left side of the heart and teminates before reaching the posterior interventricular sulcus.

Question 2

Coronary Sinus

Answer 2

A sac-like structure on the posterior side of the heart that empties into the RA. Where most of the cardiac veins terminate.

Question 3

Great Cardiac Vein

Answer 3

Originates near the apex of the heart and travels in the anterior interventricular sulcus with the LAD. It then enters the coronary sulcus and travels to the posterior side with the circumflex artery and merges with the cornoary sinus.

Question 4

Middle Cardiac Vein

Answer 4

Travels in the posterior interventricular sulcus with the posterior interventricular artery and terminates in the coronary sinus.

Question 5

Small Cardiac Vein

Answer 5

Travels with the marginal branch of the right coronary artery and enters the coronary sinus near the inferior vena cava.

Question 6

Anterior Cardiac Veins

Answer 6

Transmit blood from the RV directly into the RA not via the coronary sinus.

Question 7

Right Coronary Artery

Answer 7

Emerges from the ascending aorta near the tip of the right auricle. It travels in the coronary sulcus between the RA and RV. Three important branches include sinoatrial nodal artery, marginal artery, and the posterior interventricular artery. Supplies the AV node with a small AV nodal branch.