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Abbreviation for superficial musculoaponeurotic system.
Substance Misuse Advisory Service (extinct)
superficial musculo-aponeurotic system
superior mesenteric artery syndrome
superficial muscular aponeurotic system,
The nerves, blood vessels, fat, and fibrous tissue that connects the facial skin to its underlying musculature. Operations that rejuvenate the face ("face lifts") often revise or sculpt this tissue to reduce age-related sagging or drooping.