Superficial Musculoaponeurotic System
Pronunciation: soo-PER-fish-ul MUS-kyoo-loh-ap-oh-nyoo-ROT-ik SIS-tem
A fibromuscular layer of the face connecting skin to underlying muscle, abbreviated SMAS, and relevant to understanding filler placement depth and surgical facial rejuvenation.
Full Definition
The superficial musculoaponeurotic system (SMAS) is a continuous fibromuscular sheet enveloping the muscles of facial expression, lying beneath the subcutaneous fat of the face and neck. In cosmetic dermatology literature, it is referenced when discussing filler injection planes, thread lift anchor points, and the anatomical basis for facial aging. Editors will encounter the acronym SMAS far more frequently than the full form. The compound adjective 'musculoaponeurotic' is a single hyphen-free word in most style conventions. Misplaced injections relative to the SMAS can carry significant complication risk, making precise anatomical language critical in clinical documentation.
Usage
Usage note: 'Musculoaponeurotic' is written as one closed compound word with no hyphen. The acronym SMAS should be defined on first use in any clinical document.
In Context
- "The article described how deep plane techniques target the SMAS rather than superficial subcutaneous tissue." — Peer-reviewed journal article
- "Check that 'superficial musculoaponeurotic system' is spelled out in full on first mention before being abbreviated to SMAS." — Copy-editing checklist