| Blue Histology - Vascular System (3916 words) |
 | Larger vessels are therefore accompanied by smaller blood vessels which supply the tunica adventitia and, in the largest vessels, the outer part of the tunica media of the vessel wall. |
| It is difficult to identify an external elastic lamina or to distinguish the tunica adventitia from the connective tissue surrounding the vessel. |
| The tunica media is, again as compared to the artery, very thin and there is no sharp border between the tunica media and the tunica adventitia. |
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