1. Biology 322 Human Anatomy I
Heart

3. Heart:
Mass: g
Located in center of
thorax (mediastinum)
Anterior to vertebrae
Posterior to sternum &
2nd through 6th ribs
Superior to diaphragm
Surrounded by lungs
All vessels, nerves, etc. enter or leave superior end ("base")

4. 3 Tissue Layers of Heart:
(Outer Surface) Epicardium - Thin, connective tissue

5. 3 Tissue Layers of Heart:
(Outer Surface) Epicardium - Thin, connective tissue
Myocardium - Thick, cardiac muscle

6. 3 Tissue Layers of Heart:
(Outer Surface) Epicardium - Thin, connective tissue
Myocardium - Thick, cardiac muscle
(Inner Surface) Endocardium - Thin, connective tissue
Simple squamous epithelium
lines inner surface, next to blood

7. Myocardium: Cardiac Muscle

8. Heart surrounded by double-layered pericardium
Visceral Layer
Parietal Layer
Serous Pericardium
Visceral Layer
Parietal Layer
Heart
Pericardial
Cavity

9. Heart surrounded by double-layered pericardium
Fibrous Pericardium
Serous Pericardium
Visceral Layer
Parietal Layer
Heart
Pericardial
Cavity

12. Anterior View Aorta Superior Vena Cava Pulmonary Trunk
Inferior Vena Cava

13. Anterior View
Left Atrium
Right Atrium
Left Ventricle
Right Ventricle

14. Anterior View Left Atrioventricular Sulcus
Right Atrioventricular Sulcus
Anterior Interventricular Suclus

15. Posterior View
Right Atrium
Left Atrium
Right Ventricle
Left Ventricle

16. Posterior View Left Atrioventricular Sulcus
Right Atrioventricular Sulcus
Posterior Interventricular Suclus

17. Posterior View Superior Vena Cava Aorta Pulmonary Arteries
Inferior Vena Cava
Pulmonary Veins

19. Left Coronary Artery
Circumflex Coronary Artery
Right Coronary Artery
Anterior Interventricular Coronary Artery
Marginal Coronary Artery

20. Circumflex Coronary Artery
Right Coronary Artery
Posterior Interventricular Coronary Artery

21. Anterior Cardiac Veins
Great Cardiac Vein
Small Cardiac Vein

22. Great Cardiac Vein
Small Cardiac Vein
Middle Cardiac Vein
Coronary Sinus

25. Valves of the Heart:
Right Atrioventricular Valve
(Tricuspid valve)
Right Atrium to Right Ventricle

26. Valves of the Heart:
Right Atrioventricular Valve
Pulmonary Valve
(Right semilunar valve)
Right Ventricle to
Pulmonary Trunk

27. Valves of the Heart:
Right Atrioventricular Valve
Pulmonary Valve
Left Atrioventricular Valve (Bicuspid or Mitral valve)
Left Atrium to Left Ventricle

28. Valves of the Heart:
Right Atrioventricular Valve
Pulmonary Valve
Left Atrioventricular Valve
Aortic Valve
(Left semilunar valve)
Left Ventricle to
Ascending Trunk

29. Valves of the Heart:
Right Atrioventricular Valve
Pulmonary Valve
Left Atrioventricular Valve
Aortic Valve
Note: There are no valves controlling movement of blood
a) From superior or inferior vena cavae into right atrium
b) From pulmonary veins into left atrium

31. Intrinsic Cardiac Conduction System
1. Sinoatrial
Node
2. Atrioventricular
Node
3. Atrioventricular
Bundle (of “His”)
4. Right and Left
Bundle Branches
5. Purkinje Fibers