Thursday, December 15, 2011

Artery Wall Structure

The artery wall structure of the aorta and other large arteries near the heart are composed of three well-defined layers: 1) the tunica adventitia, the external layer, which consists of connective tissue; 2) tunica media, the middle and thickest layer, composed of elastic fibers arranged in circles in the form of fenestrated (with tiny gaps) elastic membranes, polisacharide substances and connective tissue; 3) the tunica intima, the inner and thinnest layer, which is a single layer made up of simple squamous endothelial cells.