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Artery Structure

Image Source: Boehringer Ingleheim International

Image source:

Below is a cross-section of a normal coronary artery showing the three layers.

The intima is the inner lining (endothelium)
It protects the vessel from damage.

The media is smooth muscle and regulates blood flow by dilating and constricting.

The adventitia is the outer layer and supplies the vessel itself with blood.

Histology slide  courtesy of Dr Gwen Childs