name: opercular artery
def: "The opercular artery arises from the hyoid stump on the first aortic arch, then follows the lateral margin of the operculum (gill covering) ventrally to reconnect into the proximal part of the first aortic arch. Isogai et al. 2001." [ZFIN:curator]
synonym: "ORA" EXACT 
synonym: "external carotid artery" EXACT 
is_a: TAO:0000005 ! artery
relationship: develops_from TAO:0005006 ! aortic arch 2
Note the conflict between the text definition and the relationship. Also, in ZFA the relationship is to arch 1.
From fig12.14 of Kardong, it looks like it could go either way
Also I see that in ZFA and TAO 'internal carotid artery' is an only part-of child to 'carotid artery'. Is there any relationship between the external carotid and the carotid? If so it should be added.
The def of carotid is:
"Artery originating at the junction of the first two aortic arches and supplying the anterior brain."
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