Embryonic intersegmental anastomosis between the external carotid and vertebral arteries. Classification problems of the proatlantal artery.
D000328:Adult; D001163:Arteriovenous Anastomosis / Q000033:anatomy & histology / Q000000981:diagnostic imaging* / Q000196:embryology; D002342:Carotid Artery, External / Q000033:anatomy & histology; D005260:Female; D006801:Humans; D011859:Radiography; D014711:Vertebral Artery / Q000033:anatomy & histology