Coronary Arteries

Question 1

Describe the course of the sinoatrial (SA) nodal artery (branch of RCA)

Answer 1

• its one of the first branches of the right coronary that encircles the base of the superior vena cava to supply the SA node

Question 2

Describe the course of the atrioventricular (AV) nodal artery (branch of RCA)

Answer 2

• Arises from the distal end of the right coronary artery as it forms the posterior interventricular a. on the posterior aspect of the heart
• penetrates the lower aspect of the interatrial septum to supply the AV node

Question 3

Describe the course of the Posterior Interventricular artery (branch of RCA)

Answer 3

• its the terminal distribution of the right coronary artery on the diaphragmetic surface of the heart
• forms septal branches that penetrate and supply the POSTERIOR 1/3 of the INTERVENTRICULAR SEPTUM

Question 4

Describe the course of the interventricular artery (branch of LCA)

Answer 4

• descends into the anterior interventricular sulcus and supplies:

1. Anterior left ventricular wall
2. anterior 2/3 of the interventricular septum
3. bundle of His (in the IV septum)

Question 5

Describe the course of the circumflex artery (branch of the LCA)

Answer 5

• goes around left border of the heart and supplies:

1. the left border of the left ventricle
2. posterior-inferior aspectof the left ventricular wall