1. Anatomy of Blood Vessels
Exercise 32
Anatomy of Blood Vessels

2. Objectives Tunics of blood vessel walls
Artery, vein, capillary structural differences correlated to functional differences
Artery and vein cross-sections
Major arteries and veins

3. Tunics of Blood Vessel (Artery & Vein) Walls
Fig. 21-1

4. Tunics of Blood Vessel (Artery & Vein) Walls
Tunica intima (interna)
Lines the lumen
Single, smooth endothelial layer (squamous)
Continuous with heart’s endocardium

5. Tunics of Blood Vessel (Artery & Vein) Walls
Tunica media
Bulky middle layer
Smooth muscle, elastin
Smooth muscle regulates diameter of vessel  blood pressure

6. Tunics of Blood Vessel (Artery & Vein) Walls
Tunica adentitia (externa)
Outermost layer
Areolar or fibrous connective tissue
Support/protection

7. Artery, Vein, or Capillary?
Arteries
Walls generally thicker vs. veins
Tunica media has more muscle & elastic tissue:
Large arteries actually closer to the pumping of the heart
Able to expand as large amts of blood enter them, recoil as blood passes through  ELASTIC arteries
Smaller arteries less elastic tissue, moderate muscle  MUSCULAR arteries

8. Artery, Vein, or Capillary?
Veins
Far removed from the heart
Low-pressure, not that big pressure change situation found in arteries
Thinner walled
Often flows against gravity—modification:
Lumens of veins larger
Valves prevent backflow
Skeletal muscles “pump” (“milk”) blood toward the heart

9. Fig. 21-1

10. Artery, Vein, or Capillary?
Capillaries
Transparent walls, one cell thick
Tunica intima only
Easy gas exchange between blood and tissue’s cells

11. Fig. 21-4

12. Fig. 21-2

13. Right pulmonary artery
Major Arteries
Right pulmonary artery
To lungs, capillary exchange CO2/O2
Left pulmonary artery
Pulmonary Trunk
Fig

14. Major Arteries: The Aorta
Thoracic aorta
Abdominal aorta
Fig

15. Major Arteries
R, L subclavians
Brachiocephalic
Fig

16. R, L
Fig

17. Superficial temporal
Facial
Facial
Fig

18. (R, L) Internal thoracic
(mammary)
Fig

19. Axillary artery Brachial artery
Fig
Axillary artery
Brachial artery

20. Radial artery Ulnar artery
Fig
Radial artery
Ulnar artery

21. Superficial palmar arch
Fig
Superficial palmar arch
Digital arteries

23. Branches from Abdominal Aorta
Celiac Trunk
Left gastric artery
Hepatic artery
Splenic artery
Fig

24. Fig

25. Branches from Abdominal Aorta
Superior mesenteric artery
R, L renal artery
Inferior mesenteric artery
R, L gonadal artery
Fig

27. R, L common iliac arteries
R, L external iliac arteries
R, L internal iliac arteries
Fig

29. Lateral circumflex femoral artery Popliteal artery
Deep femoral artery
Lateral circumflex femoral artery
Popliteal artery
Posterior tibial artery
Anterior tibial artery
Fig

31. From lungs, capillary exchange CO2/O2
MAJOR VEINS
R, L pulmonary veins
From lungs, capillary exchange CO2/O2
Superior vena cava
Inferior vena cava

32. R, L brachiocephalic veins
Fig

33. R, L subclavian veins
Fig

34. Superficial temporal vein
Facial vein
Fig

35. R, L external jugular veins
Fig

36. R, L internal jugular veins
Fig

37. Branches of Inferior Vena Cava
R, L
R, L
Fig

38. Superior mesenteric vein Inferior mesenteric vein
Hepatic Portal System
Left gastric vein
Right gastric vein
Superior mesenteric vein
Splenic vein
Inferior mesenteric vein
Fig

39. R, L common iliac vein R, L internal iliac vein
R, L external iliac vein
R, L femoral vein
Great saphenous vein
Fig

40. Website with interactive A & P model photos