Levator labii superioris alaeque nasalis (LLSAN) muscle is traditionally thought of as a muscle of the mouth but is also a crucial muscle of the nose. Interestingly, it has the longest name of any muscle in the human body.
Origin: maxilla, nasal bone, medial canthus
Insertion: nasal base
Innervation: facial nerve (VII)
Action: depressor of the tip of the nostril
Ask your patient to smile and look for the slight protrusion of the LLSN Inject perpendicular in the position above.
Inject 4/5 units of toxin in the post shown above deep into the muscle.
Review in 2 weeks for additional treatment if a satisfactory outcome is not achieved.