SMAS
Also written as: SMAS — Superficial Musculoaponeurotic System
Fibromuscular layer beneath facial skin that is manipulated during advanced facelift procedures.
Full Definition
SMAS (Superficial Musculoaponeurotic System) is a complex fibromuscular layer that lies beneath the facial skin and subcutaneous fat, connecting facial muscles to the overlying skin. This anatomical structure extends from the scalp to the neck and includes the platysma muscle, facial muscles, and their associated fibrous connections. In plastic surgery, particularly facelift procedures, manipulation of the SMAS layer is crucial for achieving long-lasting, natural-looking results. SMAS techniques may involve plication (folding and suturing), excision, or deep plane dissection, each offering different advantages for facial rejuvenation. Understanding SMAS anatomy is essential for avoiding facial nerve injury and achieving optimal surgical outcomes.
Usage
Usage note: Critical anatomical structure in facial surgery; specify manipulation technique when documenting.
In Context
- "The surgeon performed SMAS plication to achieve durable lifting of the midface and jowl areas." — Surgical technique description
- "Deep plane facelift involves elevation of the SMAS layer while preserving its attachments to facial muscles." — Procedural guideline