1. Cardiovascular System: Putting the Heart into Histo

2. Mesothelium Lecture 9, Slide 1

3. 3 Layers Endocardium Myocardium Epicardium L9, S2

4. Fibrous Trigone Forms the base of tissue from which the valves are anchored Separates atria from ventricles Atria and ventricle only communicate through the AV bundle L9, S2

5. Epicardium DFIACT DFIACT Adipose Adipose Coronary vessels and cardiac nerves Coronary vessels and cardiac nerves Externally lined by mesothelium Externally lined by mesothelium Simple squamous cells Simple squamous cells Secrete serous fluid at visceral and parietal pericardium Secrete serous fluid at visceral and parietal pericardium L9, S3

6. Z I M AH L9, S5

7. Myocardium L9, S6 L9, S4

8. Masson’s Trichrome Endocardium Inner layer Inner layer Simple squamous epithelium and CT Simple squamous epithelium and CT Elastic lamina Elastic lamina Middle layer Middle layer LACT with smooth muscle LACT with smooth muscle Subendocardial layer Subendocardial layer Purkinje fibers Purkinje fibers Continuous with myocardium Continuous with myocardium L9, S7

9. Purkinje Fibers Branches of the AV bundle of His Branches of the AV bundle of His Cardiac muscle modified for conducting impulses Cardiac muscle modified for conducting impulses Located in the subendothelium Located in the subendothelium L9, S11

10. Hypertrophied cardiac muscle fibers One or two nuclei centrally situated Rich in glycogen and mitochondria L9, S12

11. 1 2 3 Tunica Intima Internal Elastic Membrane Tunica Media External Elastic Membrane Tunica Adventitia L9, S13

12. The Aorta: An Elastic Artery Tunica Intima Endothelium and BM Internal Elastic Membrane Tunica Media Reticular or Elastic fibers SMCs connecting elastic fibers External Elastic Membrane Tunica Adventitia Diffuse Vasa vasorum Nervi vascularus L9, S16 L9, S15

13. A B C D E F G A = Aorta A = Aorta B = Vein B = Vein C = Artery C = Artery D = Nerve D = Nerve E = Brown adipose E = Brown adipose F = White adipose F = White adipose G = CT G = CT L9, S17

14. Aorta Weigert Stain of the Elastic lamina Weigert Stain of the Elastic lamina L9, S19

15. A B C D E. None of the above Q1 L9, S6L9, S4

16. AB Q2 and Q3 L9, S12