Whitney Zackary B., Jain Megha, Zito Patrick M.
Maulana Azad Medical College
University of Miami; Miller School of Medicine
The superficial musculoaponeurotic system, or SMAS, is often described as an organized fibrous network composed of the platysma muscle, parotid fascia, and fibromuscular layer covering the cheek. This system divides the face's deep and superficial adipose tissue and has region-specific morphology. Anatomically, the SMAS lies inferior to the zygomatic arch and superior to the platysma's muscular belly. The fibromuscular layer of the SMAS integrates with the superficial temporal fascia and frontalis muscle superiorly and platysma inferiorly. The SMAS may even be described as a fibrous degeneration of the platysma itself. In reality, a precise anatomical definition of the SMAS is unclear and has been thoroughly debated since Mitz and Peyronie first described this fibromuscular network in 1976. The SMAS is a key structure involved in facial aging. Understanding the anatomy and dynamics of the SMAS is critical for healthcare providers specializing in facial rejuvenation procedures.
表浅肌肉腱膜系统，即SMAS，通常被描述为一个由颈阔肌、腮腺筋膜以及覆盖脸颊的纤维肌肉层组成的有组织的纤维网络。该系统分隔了面部的深层和浅层脂肪组织，且具有区域特异性形态。从解剖学角度来看，SMAS位于颧弓下方、颈阔肌肌腹上方。SMAS的纤维肌肉层向上与颞浅筋膜和额肌融合，向下与颈阔肌融合。SMAS甚至可被描述为颈阔肌自身的纤维性退变。实际上，自1976年米茨和佩罗尼首次描述这个纤维肌肉网络以来，SMAS的确切解剖学定义尚不明确，且一直存在激烈争论。SMAS是面部衰老过程中涉及的关键结构。了解SMAS的解剖结构和动态变化对于专注于面部年轻化手术的医疗保健人员至关重要。
