Abbe Estlander Flap : based on which artery?

Abbe Estlander Flap  This flap also has a named artery and an excellent blood supply.  The pedicle of the flap is very small.  The biggest disadvantage is that two operations are required and the patient must have his lips sewn together for 4 to 6 weeks.  The blood supply to this flap is from the superior labial or inferior labial artery, both are branches of the facial artery and are of the external carotid artery system.  

That means for an upper lip cleft lip, lower lip flap is used (inferior labial artery) and for lower lip cancer upper lip flap is used(ie., superior labial artery). I had this confusion, that's why this has been posted. Revision for those who already knew. !

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Dr. Dhanesh Vijayan