In essence, all blood vessels consist of a tube with the luminal lining of endothelial cells surrounded by varying amounts of smooth muscle cells and extracellular matrix. however, the structure of each of these components varies in different parts of the vasculature.
According to functional needs to accommodate the pulsatile flow. And higher blood pressures arterial was are thicker than veins and invested with reinforcing layers of smooth muscle cells. As arteries narrow to the ratio was a thickness to lumen diameter increases to allow more precise regulation of intravascular pressures veins. On the other hand are dispensable involve vessels with high capacitance in keeping with the specializations certain. Pathologic lesions characteristically involve a particular kind of vessel. for example, atherosclerosis occurs mainly in larger muscular trophies. Why hypertension affects small arterials and specific forms of vasculitis. Selectively involved vessels of only a certain caliber vessel walls are organized into three concentric layers intima-media and adventitia.
These layers are present in all vessels. But are most of their and in larger vessels and particularly arteries. The intima consists of an endothelial cell. Monolayer on a basement membrane with minimal underlying ECM, surrounded by loose connective tissue.
Nerve fibers and smaller vessels of the advantage. An external elastic lamina is present in some arteries. Defines the transition between media and advantage of diffusion of Oxygen and nutrients from the lumen inadequate. To sustain thin-walled vessels and the intimal smooth muscle cells of all vessels in the large and medium-sized vessel. However small 8 Furious within the adventitia supplied the outer half to two-thirds of the media.