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Major variations in branching patterns of the external carotid artery (3 types) and variations in the confluence of the facial, lingual, and superior thyroid veins with internal jugular vein (5 types)
Variant TypeDescription
Arterial
    Noncommon trunkFacial, lingual, and superior thyroid arteries arise separately from the ECA
    Truncus linguofacialisFacial and lingual arteries arise from the ECA in a common trunk
    Truncus thyrolingualisSuperior thyroid and lingual arteries arise from the ECA in a common trunk
Venous
    ThyrolinguofacialisFacial, lingual, and superior thyroid veins form a thyrolinguofacialis vein
    LinguofacialisFacial and lingual veins form a venous stem
    ThyrofacialisFacial and superior thyroid veins join together, and separate lingua l vein joins into the IJV
    Nonfacial veinSuperior thyroid and lingual veins join together into the IJV
    SeparationLingual and superior thyroid veins fuse independently with the IJV
  • Note:—ECA indicates external carotid artery; IJV, internal jugular vein.