1. Anatomy of the Heart
Epicardium: thin outer connective layer where coronary vessels travel through (Fat)
Endocardium: thin connective layer that lines the interior of the heart (no fat)
Myocardium: thick middle muscle layer that performs the work of the heart
Fibrous skeleton: support and anchor

2. Chambers
R atria: thin myocardium, receives blood from the three great veins
L atria: thin myocardium, receives blood from pulmonary veins
R ventricle: thicker myocardium, receives from tricuspid, pushes to pulmonary arteries
L ventricle: thickest myocardium, receives from bicuspid, pushes to rest of body
Chambers divided by septum's

3. Valves Valves ensure one-way flow
Each valve is made of two to three fibrous flaps called cusps
Chordae tendineae: fibrous strings that attach to cusps and papillary muscles of ventricles to reduce bulging
Semilunar valves: each has three flaps regulated by pressure differences