We aren't going to worry yet about the difference between an artery and an arteriole, or a vein and a venule.
Both types of blood vessel have an inner lining of simple, flat cells called "endothelium". They often, but not always, contain at least a few red blood cells.
Except for one curious exception in the ear, blood vessels run only through fibrous tissue, never through epithelium. Even in muscle and nervous tissue, they are always surrounded by at least a tiny rim of collagen fibers.
This is a bit of fibrous tissue bearing two arteries and a vein.
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Kansas City University of Medicine and Biosciences