Depressor septi nasi modifications in rhinoplasty: a review of anatomy and surgical techniques

Overview

The nasal muscles coordinate the nose and upper lip during a smile. Overactivity or anatomical variation in those muscles can produce a visible deformity when the face moves. The authors state that rhinoplasty is usually planned without considering these dynamic forces, and that once patients recover muscle function after surgery the undamaged pull can rotate the tip downward over the long term.

Sections of note

• Review of anatomy and surgical technique. No study design, patient numbers, results, follow-up or complication rates are reported.
• The focus is the depressor septi nasi muscle, which pulls the tip down and shortens the upper lip during smiling.
• Overactivity of this muscle is said to worsen the smiling deformity, producing a sharper nasolabial angle.
• The levator labii superioris alaeque nasi and orbicularis oris muscles are described as contributing to the same effect.
• The authors state that late downward rotation of the tip after surgery correlates with the patient's preoperative muscle function.
• The article aims both to describe correction of the deformity and to compare treatment alternatives for use in rhinoplasty.

What it means for a patient

• A nose that looks correct at rest can still drop or distort when you smile, and that is muscle driven rather than a shaping error.
• Smile patterns are worth examining before surgery, because muscle pull can undo tip rotation months later.
• The abstract reports no outcome figures, so no technique here is shown to prevent that late change.
• The article is a review of anatomy and options, not a trial comparing treatments.

Why this paper matters

Most rhinoplasty planning uses static photographs, and this article makes the case for assessing the moving face as well. Unanswered is how much late derotation the muscle actually causes, and whether treating it changes long term results.

Terms

• Depressor septi nasi: a small muscle that pulls the nasal tip down when you smile.
• Dynamic function: how a structure behaves when the face moves rather than at rest.
• Nasolabial angle: the angle between the base of the nose and the upper lip.
• Levator labii superioris alaeque nasi: a muscle that lifts the upper lip and nostril.
• Orbicularis oris: the ring of muscle around the mouth.
• Derotation: the tip dropping back down after surgery.