Copyright

Platysma Muscle: Action, Origin & Innervation

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/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.

The platysma muscle extends from the upper chest and shoulder area to the lower part of the face.
platysma

Platysma Muscle: Action

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
  • Pulling the jawbone down which opens the mouth

One action of the platysma muscle is to bring the corner of the lips out to the side and down, such as when a person frowns.
frown

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.

Platysma Muscle: Origin

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

Platysma Muscle: Innervation

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.

To unlock this lesson you must be a Study.com Member.
Create your account

Register to view this lesson

Are you a student or a teacher?

Unlock Your Education

See for yourself why 30 million people use Study.com

Become a Study.com member and start learning now.
Become a Member  Back
What teachers are saying about Study.com
Try it risk-free for 30 days

Earning College Credit

Did you know… We have over 200 college courses that prepare you to earn credit by exam that is accepted by over 1,500 colleges and universities. You can test out of the first two years of college and save thousands off your degree. Anyone can earn credit-by-exam regardless of age or education level.

To learn more, visit our Earning Credit Page

Transferring credit to the school of your choice

Not sure what college you want to attend yet? Study.com has thousands of articles about every imaginable degree, area of study and career path that can help you find the school that's right for you.

Create an account to start this course today
Try it risk-free for 30 days!
Create an account
Support