Assertion: vein's layer | /r/HasProperty | collagen fibers
Facets:
value: with the largest arteries
type: OTHER
Source sentences:
text: The outermost layer of an artery (or vein) is known as the tunica externa, also known as tunica adventitia, and is composed of collagen fibers and elastic tissue - with the largest arteries containing vasa vasorum (small blood vessels that supply large blood vessels).