PLATYSMA

• Origin

Fascia of Pectoralis Major and Deltoid muscles

• Insertion

Mandible and Orbicularis Oris

• Agonist(s)

- Depressor anguli oris

- Depressor labii inferioris

• Antagonist(s)

- Levator labii superioris

- Levator anguli oris

• Function

Depression of Mandible and Corner of Mouth