The platysma (also platysma muscle, latin: platysma) is a wide, flat, superficial neck muscle extending from the lower part of the face to the upper thorax.
The platysma is a paired thin and superficial muscle arising from the upper parts of the shoulders and inserting into the mouth area. The platysma partly covers the pectoralis major and deltoid muscles. In the mouth area, the platysma divides in mandibular, labial and modiolar (nodular) parts.
The platysma originates from skin over the lower neck and the upper lateral chest area and inserts on the inferior border of the mandible and into skin over the lower face and the angle of the mouth.
Contractions of the platysma depress and wrinkle skin of the lower face and the mouth. The platysma also contributes to forced depression of the mandible.
The platysma is innervated by the cervical branch of the facial nerve (CN VII).