Platysma Muscle

Give the origin, insertion, nerve supply and actions of the platysma.
Answer.

The platysma is a thin, quadrilateral, broad sheet of muscle in the superficial fascia of the side of the neck.

Head And Neck Scalp temple and face Origin and insertion of the platysma

Platysma Origin From skin and deep fascia covering the pectoralis major and anterior part of the deltoid.

Platysma Insertion Into the lower border of the mandible and angle of mouth.

Platysma Nerve is supplied By the cervical branch of the facial nerve.

Platysma Actions

Forms wrinkles in the skin of the neck
Releases pressure of the skin on the underlying superficial veins of the neck to help in venous return
Draws the angle of the mouth downward and laterally as seen clearly in the faces of marathon runners.

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