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The Arterial Vascular System (Elastic Arteries (Composition (Tunica…
The Arterial Vascular System
Elastic Arteries
Responsible for the stabilisation of blood flow and pressure.
Examples include the elastic arteries of the aorta and its major branches.
Yellowish in colour due to the large deposit of elastic tissue in their tunica media.
Composition
Tunica Intima
Basal lamina of endothelial cells
Mixed Type IV Collagen and Elastic Fibres
Endothelium of squamous cells
Myointimal cells and Fibroblasts
Tunica Media
Smooth muscle sheets
Type III collagen fibres
Fenestrated sheets of elastic tissue
Ground substance of
proteoglycan
and
glycoprotein
.
Tunica Adventitia
Type I Collagen and elastic fibres
Vasa vasorum
Not well developed.
Nerve fibres
Lymphatics
LAYER OF INTERNAL ELASTIC LAMINA
Muscular Arteries
Regulate blood flow to the tissues and organs.
Examples include Axillary artery, femoral artery, renal artery, uterine artery, superior mesenteric artery, maxillary artery.
Composition
Tunica Intima
Basal lamina of endothelial cells
Type IV collagen fibres
Endothelium of squamous cells
Few smooth muscle cells.
LAYER OF INTERNAL ELASTIC LAMINA
Tunica Media
Several layers of smooth muscle cells (up to 40 layers)
Elastic lamina, recticular fibres (type III collagen) & proteoglycans.
LAYER OF EXTERNAL ELASTIC LAMINA
Tunica Adventitia
Bibroblasts and adipose cells
Vasa vasorum
Type I collagen fibres and elastic fibres
Nerve fibres
Lymphatics
Arterioles
Large arterioles are involved in local regulation of blood flow.
Composition
Tunica Intima
Basal lamina
Type IV collagen fibres
Endothelium
LAYER OF INTERAL ELASTIC LAMINA
Tunica Media
Six layers of smooth muscle
Tunica Adventitia
Vasa vasorum
Nerve fibres
Thick collagen fibres
Lymphatics