Histological Structure of Blood vessels Tunica LARGE VEIN n ELASTIC ARTERY Internal elastic externa intima Endothelium Tu Tunica externa Tunica intima Endothelium MUSCULAR ARTERY MEDIUM-SIZED VEIN Tunica Tunica externa Tunica media Tunica intima Tunica intima Endothelium ARTERIOLE VENULE Smooth muscle cells Tu Endotheliul externa Basal lamina Endothelium CONTINUOUS CAPILLARY FENESTRATED CAPILLARY △ Endothelial cells Endothelial cells Basal lamina Basal laminaHistological Structure of Blood Vessels