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  Artery and vein c.s. (close-up view)

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 1. Lumen of the artery

 2. Tunica intima (interna)

 3. Tunica adventitia (externa)

 4. Tunica media

 5. Wall of the vein

 6. Lumen of the vein

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This image shows a magnified, cross-sectional view of a portion of an artery and vein.  Note that the three distinct tissue layers mentioned above are easily seen in the wall of the artery.  Although veins have the same three tissue layers, they are not so evident as those found in the much thicker artery.

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