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what is this - a
artery
what is b
tunica externa
what is c // internal elastic membrane- dark, wavy line
tunica interna
what is d // external elastic membrane- less wavy
tunica media
what is this- a
vein
what is b
lumen
what is c // no internal elastic membrane
tunica interna
what is d // no external elastic membrane
tunica media
what is e
tunica externa
a
vein
b
artery
Green
Vasa vasorum