Cardiac Anatomy

Question 1

What arteries arise from the right coronary artery?

Answer 1

Acute marginal branches
AV nodal artery
Posterior intraventricular artery -> posterior descending artery

Question 2

What arteries arise from the left coronary artery?

Answer 2

Left anterior descending artery -> septal + diagonal branches
Left circumflex arty

Question 3

What is the venous drainage for the heart?

Answer 3

Most venous blood goes into RA via coronary sinus

Some venous blood goes into Thesbian veins into all 4 chambers

Question 4

What are the layers of the heart?

Answer 4

Endocardium 
Myocardium
Epicardium 
Visceral pericardium 
Pericardial cavity 
Parietal pericardium

Question 5

Which valves are semilunar?

Answer 5

Aortic + pulmonary

Question 6

Which are the AV valves?

Answer 6

Tricuspid

Mitral/ bicuspid

Question 7

Describe the sympathetic innervation of the heart

Answer 7

Innervate SA + AV node, myocardium + vasculature

B1 + B2 receptor stimulation lead to increased HR, vasodilation + increased SV

Question 8

Describe the parasympathetic innervation of the heart

Answer 8

Vagus nerve innervates SA + AV node

Parasympathetic innervation via muscarinic receptors = reduced HR + SV, vasoconstriction