SMAS
Pronunciation: SMAS (pronounced as individual letters)
Also written as: SMAS — superficial musculoaponeurotic system
Fascial layer connecting facial muscles and overlying skin, crucial target in facial rejuvenation surgery.
Full Definition
The superficial musculoaponeurotic system (SMAS) is a continuous fibromuscular layer that lies beneath the subcutaneous fat and connects the platysma muscle of the neck to the muscles of facial expression. This anatomical structure serves as the foundation for modern facelift techniques, as it provides a strong, well-vascularized layer that can be repositioned to achieve natural-appearing facial rejuvenation. SMAS manipulation allows surgeons to address deeper tissues rather than relying solely on skin tightening, resulting in longer-lasting results with less tension on skin closures. Understanding SMAS anatomy is essential for safe facial surgery, as the facial nerve branches lie deep to this layer.
Usage
Usage note: Always capitalize as SMAS; spell out on first use in formal documents.
In Context
- "SMAS plication was performed to achieve long-lasting facial rejuvenation without excessive skin tension." — operative report
- "The facial nerve branches lie deep to the SMAS layer, requiring careful dissection." — anatomical reference