The "Segmental SMAS Model": A Didactic Concept of Face and Neck Lift Anatomy.

Profound understanding of the surgical anatomy of the face and neck is the key to successful face lift surgery. The "Segmental SMAS Model" presented herein is the result of a decade-long effort in teaching fellows a logical and coherent anatomic model of face lift anatomy. The superficial musculo-aponeurotic system (SMAS) consists of segments with distinct surgical characteristics. These are determined by the presence of a deep gliding plane and/or adhesion through fibrous insertions. In this article, we define SMAS segments that are profoundly heterogeneous in their behavior and have surgical implications on the maneuvers required for a deep plane face lift. The present model introduces several novel interpretations of the surgical anatomy of the face and neck lift procedure and hopes to convey a better understanding of face lift anatomy to training surgeons.