Subcutaneous tissue of infraclavicular and supraclavicular regions.
Insertion of Platysma
Base of mandible; skin of cheek and lower lip; angle of mouth; orbicularis oris.
Muscle Action/Function of Platysma
Draws the corners of the mouth inferiorly and widens it (as in expressions of sadness and fright). Also draws the skin of the neck superiorly when teeth are clenched.
Arterial (Blood) Supply of Platysma
Branches of the Submental artery and Suprascapular artery.