1. Structure of Blood Vessels
Composed of 3 layers (tunics)
1. Tunica Intima (interna) – simple squamous epithelium
2. Tunica Media – sheets of smooth muscle
Contraction – vasoconstriction
Relaxation – vasodilation
3. Tunica Externa – connective tissue
* Lumen – central blood-filled space of a vessel

7. Capillaries 1. Continuous Capillary Bed
- most common type in the body.
- have tight junctions
- ‘leaky’ capillaries

8. Capillaries
Venule
Ateriole

9. Arteriosclerosis
= hardening of vessel wall.
Atherosclerosis
= deposits of lipids in blood
vessel wall, forming a plaque.
results in hardening and
narrowing of vessel.

10. Vessels of the Heart

11. Arteries of the Systemic Circulation

12. Arteries of the thorax, neck,
brachium, antebrachium and palm.

14. Arteries of the Head and Neck

15. Circle of Willis

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19. Branches off of Abdominal Aorta

20. Aortic
Aneurysm
Aneurysm:
Weakening of
A vessel wall;
Results in
bulging due
to pressure in
vessel.
Poses threat of
hemorrhage.

21. Abdominal Aorta Branches
Celiac Trunk
Superior Mesenteric Artery
Renal Arteries
Gonadal Arteries
Inferior Mesenteric Artery
Common Iliacs
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22. Arteries of the
Hip,
Thigh,
Leg and
Foot