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large veins have narrow tunica intima.and tunica media consist of many layers of smooth muscle which are separated by collagenous connective tissue,and have very few elastic fibers.tunica adventitia is broad,and formed by collagen,tunica adventitia have vasa vasorum.example is femoral and renal vein. in medium size veins tunica intima is a bit more then endothelial call.and have fibrous supporting layer.tunica media is composed of 2 to 4 layers of smooth muscle fibers.tunica adventitia is thick layer and made up of collagen fibers. ........................... maniba ,hebei united medical university tangshen ,,hebei .,,,china
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