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This Concept Map, created with IHMC CmapTools, has information related to: Histology of Blood Vessels, Types of veins Large veins (greater than 10 mm), Vasoconstrictors* act on Tunica media, Vasodilators* act on Tunica media, Large arteries - "Elastic arteries" contains Vasa vasorum*, Layers of Vascular Wall middle layer Tunica media, Tunica adventitia Longitudinally arranged collagenous tissue and a few elastic fibers*, Tunica adventitia contains Vasa vasorum*, Types of arteries Large arteries - "Elastic arteries", Tunica intima Subendothelial layer*, Venules & small veins (less than 1 mm) Distinguished by the presence of pericytes just beyond the basal lamina, Endothelium* Synthesizes & secretes Vasodilators*, Medium arteries - "Muscular arteries" Tunica adventitia is thicker than in the elastic arteries. Approximately equal in thickness to the tunica media. External elastic membrane can also be seen usually separating tunica media from tunica adventita., Large arteries - "Elastic arteries" contains Nervi vascularis*, Tunica adventitia contains Nervi vascularis*, Medium veins (1-10 mm) Characterisic feature is valves to keep blood moving in one direction., Layers of Vascular Wall innermost Tunica intima, Tunica intima Basal lamina*, Venules & small veins (less than 1 mm) Muscular venules have 1 to 2 layers of smooth muscle making up the tunica media, Tunica intima Endothelium*, Layers of Vascular Wall outmost connective tissue layer Tunica adventitia