Platysma Muscle: Action, Origin & Innervation

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  • 0:04 Platysma Muscle
  • 0:27 Action
  • 1:00 Origin
  • 1:23 Innervation
  • 1:53 Lesson Summary
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Lesson Transcript
Instructor: Dan Washmuth

Dan has taught college Nutrition, Anatomy, Physiology, and Sports Nutrition courses and has a master's degree in Dietetics & Nutrition.

The platysma muscle is a muscle that runs from the upper chest and shoulders, up through the neck, and attaches to various parts of the lower face. In this lesson, learn about the action, origin, and innervation of the platysma muscle.

Platysma Muscle

Try this mini-experiment...with your fingers, touch the front sides of your neck. Now try to make the biggest frown you possibly can with your mouth. Did you feel the muscle in both sides of your neck pop out when you made the frown? That muscle is the platysma muscle, which is a muscle that runs from the upper chest/shoulder area, up through the neck, and attaches to the skin around the mouth and the lower jawbone.


Since the platysma muscle attaches to the bone and skin around the lower jawbone (also known as the mandible), the action of this muscle mostly pertains to this area of the body. The specific actions of the platysma muscle include:

  • Pulling the corner of the lips out to the side and down, and
  • Pulling the jawbone down which opens the mouth

Additionally, the platysma muscle can cause wrinkles in the neck as a person ages. As we all get older, the skin in our neck becomes less elastic and starts to sag. As this occurs, the platysma muscle can cause two large wrinkles at the front of the neck.


The origin of a muscle refers to the location of the body where the muscle begins or starts. We mentioned that the platysma muscle originates from the upper chest and shoulder area, but specifically, it originates from the fascia of the pectoral (or chest) muscle and the deltoid (shoulder) muscles. Fascia is a thin layer of fibrous connective tissue under the skin that surrounds muscles and organs.


All muscles are controlled by electrical impulses from the brain. Innervation is the process of the brain sending these electrical impulses to the muscles through a network of nerves. Each muscle receives these electrical impulses from a specific nerve.

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