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HISTOLOGY OF
CIRCULATORY SYSTEMBYDR. MUDASSAR ALI ROOMI(MBBS, M. PHIL.)
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ELASTIC
ARTERY
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ELASTIC ARTERY
Also called as large arteries
Also called as conducting arteries
IEL is not easily distinguishable. No EEL Present.
Examples: aorta and its mainbranches.
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Vasa Vasorum
Found in the walls of large arteriesand veins
function: these are Small bloodvessels which supply nutrition totunica media and tunica adventitia
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Function of elasticarteries
During systole, They absorb some ofthe pulse beat by expansion of theirwalls.
During diastole, the large arteriesreturn to normal size pushing theblood forward (windkessel effect).
They make the blood flow lessintermittent during cardiac cycle.
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LARGE ARTERY
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How to draw elastic artery!
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Elastic artery
IDENTIFICATIONPOINTS:
Tunica mediacontain 30-40layers of elastic
fibers. Smooth muscle
is less abundant
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Aneurysm
Definition: Ballooning out of anartery due to weakness of its wall.
Rupture of the aneurysm bringssevere consequences and may causedeath.
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Atherosclerosis
Definition: Lipiddeposits in the T.intima of
medium andlarge sizedarteries.
Examples:Major vesselsaffected are:
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Atherosclerosis
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LARGE VEIN
e.g. SVC, IVC, portal vein
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LARGE VEIN
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Varicose veins
Abonormallytortuous anddilated veins
Happen due tovalvularincompetence.
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