PowerPoint Lecture Slides prepared by Human Anatomy ...
PowerPoint? Lecture Slides
prepared by
Human
Anatomy
& Physiology Barbara Heard,
Atlantic Cape Community
College
Ninth Edition
19 C H A P T E R
? Annie Leibovitz/Contact Press Images
The Cardiovascular System: Blood Vessels: Part A
? 2013 Pearson Education, Inc.
Structure of Blood Vessel Walls
? Lumen
? Central blood-containing space
? Three wall layers in arteries and veins
? Tunica intima, tunica media, and tunica externa
? Capillaries
? Endothelium with sparse basal lamina
? 2013 Pearson Education, Inc.
Figure 19.1b Generalized structure of arteries, veins, and capillaries.
Tunica intima ? Endothelium ? Subendothelial layer ? Internal elastic membrane
Tunica media (smooth muscle and elastic fibers) ? External elastic membrane
Tunica externa (collagen fibers) ? Vasa vasorum
Valve
Lumen Artery
? 2013 Pearson Education, Inc.
Lumen Capillary network Vein
Basement membrane Endothelial cells
Capillary
Tunics
? Tunica intima
? Endothelium lines lumen of all vessels
? Continuous with endocardium ? Slick surface reduces friction
? Subendothelial layer in vessels larger than 1 mm; connective tissue basement membrane
? 2013 Pearson Education, Inc.
Tunics
? Tunica media
? Smooth muscle and sheets of elastin ? Sympathetic vasomotor nerve fibers control
vasoconstriction and vasodilation of vessels
? Influence blood flow and blood pressure
? 2013 Pearson Education, Inc.
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