Figure 9­31
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Some of the features of arteries and veins described in the previous image are demonstrated here at higher mag-
Holdings,
nification. Compare the thickness of the tunica media of both vessels, the artery at the right, vein at the left. The
tunica adventitia of the vein is the thickest coat of that blood vessel. Observe the absence of an internal elastic
lamina in the vein and a discrete internal elastic lamina in the artery (arrowhead).
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500

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