Superficial Musculoaponeurotic System
Pronunciation: ess-mass
The fibromuscular layer of the face, abbreviated SMAS, situated between the skin and deeper facial structures, which is a key anatomical landmark in both surgical and non-surgical aesthetic procedures.
Full Definition
The superficial musculoaponeurotic system (SMAS) is a continuous fibromuscular sheet connecting facial muscles to the overlying skin. It plays a central role in facial ageing as its laxity contributes to jowling, midface descent, and neck banding. In aesthetic dermatology, SMAS-targeting treatments—such as HIFU and deep-plane facelift techniques—aim to restore structural support. Editors should be alert to the common misspelling 'musculaponeurotic' (missing the 'o'). The abbreviation SMAS must be introduced parenthetically after the full term on first use in formal documents.
Usage
Usage note: The abbreviation SMAS is acceptable after first use; verify spelling of the full form carefully, particularly the 'musculoaponeurotic' component.
In Context
- "The treatment report noted that ultrasound energy was delivered to the superficial musculoaponeurotic system (SMAS) at 4.5 mm depth." — Clinical procedure note
- "Understanding the SMAS is essential for editors reviewing anatomical descriptions in facial rejuvenation studies." — Editorial style guide