The external carotid as a brain collateral.
D000368:Aged; D002339:Carotid Arteries / Q000601:surgery*; D002341:Carotid Artery Thrombosis / Q000601:surgery*; D002560:Cerebrovascular Circulation; D003097:Collateral Circulation; D004691:Endarterectomy; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged