Platysma
Neck
- Origin
- Fascia over the upper chest and shoulder (over the pectoralis major and deltoid)
- Insertion
- Lower border of the mandible, and the skin of the lower face and corner of the mouth
- Action
- Tenses the skin of the neck; pulls the lower lip and corners of the mouth down
- Nerve supply
- Cervical branch of the facial nerve (CN VII)
A thin sheet of muscle just under the skin of the front of the neck. It ridges the neck skin and pulls the mouth down and out, as in an expression of strain.
Platysma anatomy page →