To delineate the superior (facial) extent of the platysma muscle.
A total of 142 facial halves were examined from 71 consecutive deep-plane rhytidectomies performed over a period of 3 months. The platysma muscle was identified and isolated during the procedure. The superior extent of the platysma was measured along the line created by the angle of the mandible to the malar eminence, also known as the malar mandibular line.
On average, the platysma extended 3.98 cm along the malar mandibular line, superiorly from the inferior border of the mandible. The platysma was located 3.09 cm inferiorly from the malar eminence along the malar mandibular line. On average, the platysma muscle occupied 56% of the malar mandibular line.
The platysma muscle may have a more significant facial extension than previously described.