Arterial Supply of the Heart

What does the *AV nodal artery* penetrate to supply the *AV node*?

interatrial septum.

The *circumflex artery* courses around the *left border of the heart* in the *coronary sulcus* and supplies the *left border of the heart* via? and ends on the *Posterior aspect* of the *left ventricle* and supplies the?

marginal branch posterior inferior left ventricular wall

The R and L coronary arteries (RCA and LCA) are branches off of? (be specific)

off of the R and L aortic sinuses from the ascending aorta.

What artery is the *terminal distribution of the right coronary artery* and courses in the *posterior interventricular sulcus* to supply parts of the posterior *Right and Left ventricles* and, *importantly*, the *posterior 1/3rd of the interventricular septum*.

posterior interventricular artery

Blood flow enters the *coronary arteries* during?

*Diastole*, so anything that affects diastole will affect the amount of blood in the ventricles during filling such as *supraventricular tachycardia*.

The Anterior interventricular artery (LAD) descends in the *anterior interventricular sulcus* and provides branches to what *4 components* of the heart? 1. 2. 3. 4.

1. Anterior wall of the L Ventricle 2. anterior 2/3rds of the inter-ventricular septum 3. bundle of his 4. apex

what are the *4 branches* off of the RCA (in most people)?

1. SA nodal artery 2. AV nodal artery 3. marginal artery 4. Posterior interventricular artery (PDA)

The *Left Coronary Artery LCA* travels between the the *left auricle and ventricle* and divides into *2 branches*. What are those 2 branches?

1. circumflex artery 2. Anterior interventricular (aka LAD)

What artery arises from the *distal end of the RCA* as is forms the *Posterior interventricular artery*?

AV nodal artery

What is the most common site of *coronary occlusion*?

LAD 50%

Clinical Correlate: In a *myocardial infarction*: 1. The ___________ is obstructed in 50% of cases, 2. The ________ in 30%, 3. and the ____________ in 20% of cases.

LAD off of the LCA RCA circumflex artery off of the LCA

The blood supply to the *myocardium* is provided by branches of?

R and L coronary arteries

What artery courses in the *coronary sulcus* and supplies major parts of the *RA and RV*?

RCA

What artery encircles the *base of the SVC* to supply the SA node?

SA nodal branch off of the RCA>