Superficial Musculo-Aponeurotic System
Structure
The superficial musculo-aponeurotic system (SMAS) is the collective name for the superficial fascial structures of the face into which the muscles of facial expression insert. Histologically, this fascia is composed of fibroelastic tissue with the elastic content decreasing with age, leading to sagging of the facial skin over time. Traction of the SMAS has become standard technique in aesthetic facial surgery (Stecco & Hammer, 2014).
Related parts of the anatomy
Anatomical Relations
The SMAS is continuous superiorly with the galea capitis and caudally with the platysma muscle. It fills in the spaces around other facial structures; thus its relations are ill-defined. Rather it is found in different thicknesses across the face.
Function
The SMAS connects facial muscles to the skin allowing for facial expression.
List of Clinical Correlates
—Cosmetic surgery
References
Stecco, C. & Hammer, W. I. (2014) Functional Atlas of the Human Fascial System E-BookElsevier Health Sciences.
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Superficial Musculoaponeurotic System
Superficial musculo-aponeurotic system (SMAS) is a term traditionally given to the superficial facial fascia complex of the middle third and lower third of the face that includes the superficial facial fascia and the invested risorius and facial portion of the platysma muscles (facial SMAS).
