Copy r Superficial layer of the neck-platysma ersity 降下唇肌 depressor labii 降口角肌 facial a anterior border of platysma laryngeal prominence cervical fascia Sternocleidomastoid Platysma Copy Right- Hongqi ZHANG-Department of Anatomy-Fudan UniversityCopy Right- Hongqi ZHANG-Department of Anatomy-Fudan University Copy Right- Hongqi ZHANG-Department of Anatomy-Fudan University Platysma Superficial layer of the neck-platysma Sternocleidomastoid