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Normal Artery
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Normal Artery

Note the 3 layers of the wall, from the inside out.
The intima is limited by the internal elastic lamina, the distinct pink uniformly wavy membrane.
The intima lies to the luminal side of this membrane.
The next thick layer is the media
The adventitia lies external to the media.
Adventitias are usually thinner, but this tissue is probably from a baby.
(Description By:T.V. Rajan, M.D. )
(Image Contrib. by:T.V. Rajan, M.D. UCHC )
Normal
Etiology

N.A.
Pathogenesis

N.A.,
Epidemiology

N.A.
General Gross Description

Yellow white vessels with elastic walls.
General Microscopic Description

Large and small arteries, <1cm in diameter have 3 layers, intima, media, and adventitia.
Intima is thin and includes the endothelium, an underlying thin layer of connective tissue containing smooth muscle. An elastic fiber layer, the elastica interna, demarcates the intima from the media.
Media is thickest layer and is made up of smooth muscle and collagen fibers. Larger arteries may contain some elastic fibers.
Adventitia is sharply demarcated from the smooth muscular media, and is a thin layer containing elastic fibers in an loose connective tissue.
Clinical Correlation

N.A.
References

Burkitt G etal. Wheater's basic histopathology, 3rd ed. New York: Churchill Livingstone, 1996.
Normal
Synopsis by: J. Hasson, MD (T41000M00100)[571]
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