Base of heart

Located posteriorly, widest part of heart

Apex of heart

Located inferiorly, narrowest part of heart, points towards left side of body

4 Chambers of the heart:

Left and Right Atria, superiorly

• Auricles are ear-like extensions of the atria; expand to accommodate blood flow
• Superior and inferior vena cavae return blood to right atrium
• Pulmonary veins return blood to left atrium

Left and Right Ventricles, inferiorly

• Anterior and posterior interventricular sulci separate right from left
• Aorta carries blood away from left ventricle
• Pulmonary trunk carries blood away from right ventricle

Coronary sulcus (aka, atrioventricular groove)

Groove between the atria and ventricles where coronary vessels travel.