External Heart

Question 1

Right atrium

Answer 1

Forms the right margin of the heart

Appendage: ear-like right auricle (right atrial appendage)

Question 2

Left atrium

Answer 2

Forms much of the posterior margin of the heart

-appendage: finger like left auricle (left atrial appendage)

Question 3

Right Ventricle

Answer 3

Forms much of the anterior margin of the heart

Question 4

Left Ventricle

Answer 4

Forms much of the left margin of the heart and apex

Question 5

Right and Left atrioventricular grooves and

Anterior interventricular groove

Answer 5

They’re generally covered by fat under the serous visceral pericardium (epicardium)

Question 6

Inferior surface of the heart

Answer 6

4 pulmonary veins that enter the left atrium

The left atrium forms the BASE OF THE HEART

Question 7

Posterior left atrioventricular and

Posterior Interventricular Grooves

Answer 7

Posterior left atrioventricular groove is occupied by the coronary Sinus (venous structure)

Question 8

Right Coronary Artery

Answer 8

• branch of the ascending aorta
• passes along the coronary sulcus (right atrioventricular sulcus) to posterior surface of the heart

Branches:

• anterior right atrial branch (arises shortly after the origin of the right coronary artery, and courses superiorly underneath the right auricle toward the superior van cava. Has a branch to the SA node)
• Right marginal artery: found along the inferior margin of the heart

Question 9

Left Coronary Artery

Answer 9

• branch from the ascending aorta
• in between the pulmonary Trunk and ascending aorta

Branches:

• anterior Interventricular artery (left anterior descending artery): one of the 2 terminal branches of the LCA. Found in the anterior interventricular sulcus with the great cardiac vein
• circumflex artery: found within the Coronary sulcus wrapping around the posterior aspect of the heart

Question 10

Great cardiac Vein

Answer 10

Ascends superiorly along the anterior interventricular groove, enters the left atrioventricular groove and when it turns at the obtuse margin of the heart it becomes the coronary sinus

Question 11

Small Cardiac Vein

Answer 11

• enters near the termination of the Coronary sinus

- originates near the marginal Artery along the inferior margin of the heart

Question 12

Middle cardiac Vein

Answer 12

Runs with the posterior interventricular artery in the posterior interventricular groove.

Empties into the Coronary sinus

Question 13

Posterior Interventricular Artery

Answer 13

One of the 2 terminal branches of the RCA as it extends around the acute margin of the heart

The other terminal branch continues on in the left atrioventricular groove to form a potential anastomoses with the circumflex artery