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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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