Source:http://linkedlifedata.com/resource/umls/id/C0162867
MSH: The middle coat of blood vessel walls, composed principally of thin, cylindrical, smooth muscle cells and elastic tissue. It accounts for the bulk of the wall of most arteries. The smooth muscle cells are arranged in circular layers around the vessel, and the thickness of the coat varies with the size of the vessel.,CHV: the middle layer of an artery,NCI: The middle layer of the blood vessel wall. It consists of concentrically arranged smooth muscle and may include elastic tissue. Its thickness will depend on the type of vessel, thicker in arteries than in veins.