What Is The Function Of The Orbicularis Oris?

Orbicularis oris muscle along with the buccinator and pharyngeal constrictor form a functional unit, known as “buccinator mechanism” which has an important role in orofacial function (swallowing, sucking, whistling, chewing, vowel pronunciation, kissing).

Where is the orbicularis oculi located and what is its function?

The orbicularis oculi is a muscle in the face that closes the eyelids. It arises from the nasal part of the frontal bone, from the frontal process of the maxilla in front of the lacrimal groove, and from the anterior surface and borders of a short fibrous band, the medial palpebral ligament.

What is the action of the orbicularis oris quizlet?

Insertion: orbicularis oris. Action: draws corner of mouth laterally. Compresses cheek (as in whistling).

What happens if you damage your orbicularis oris?

If the orbicularis oris muscle is damaged, you would have difficulty opening and closing your lips, which would have an impact on speech and eating, etc…. Also, you wouldn’t be able to purse your lips so would not be able to kiss.

What is the action of the Zygomaticus major quizlet?

The zygomaticus major muscle is a muscle that controls facial expression, drawing the mouth’s angle upward and outward. The zygomaticus major muscle starts at the cheekbone and extends to the corner of the mouth. This muscle causes the corners of a person’s mouth to rise when they smile.

What is the action of the depressor Labii Inferioris quizlet?


Which muscle is responsible for closing the eye?

The orbicularis oculi muscles circle the eyes and are located just under the skin. Parts of this muscle act to open and close the eyelids and are important muscles in facial expression.

How many orbicularis oculi are there?

There are at least three defined sections of the orbicularis oculi muscle (from the outside: orbital, preseptal, and pretarsal), and the proportion of muscle fibers in the muscle is different in each section .

What does Orbicularis mean?

Medical Definition of orbicularis

: a muscle encircling an orifice.

What is the smiling muscle?

Each smile hinges on an anatomical feature known as the zygomaticus major, straps of facial muscle below the cheekbones that pull up the corners of the mouth. But it’s not the only muscle at work.

How do you strengthen the orbicularis oris muscle?

Exercise 1: Strengthen your Orbicularis Oris

  1. Using your index fingers, hook the corners of your mouth and gently pull towards the sides.
  2. Don’t overdo the stretch.
  3. Hold this position for a few seconds. …
  4. Draw the corners of your mouth toward each other, resisting the movement using your index fingers again.

Why does a Pennate muscle generate more tension than does a parallel muscle of the same size module 10.2 A?

A pennate muscle generates more tension because pennate muscle fibers lie perpendicular to the bone and parallel muscle fibers lie parallel to the bone.

What is the function of zygomaticus minor?

It draws the upper lip backward, upward, and outward (used in making sad facial expressions). Like all muscles of facial expression, it is innervated by the facial nerve (CN VII).

Which nerve is responsible for smiling?

These muscles are innervated by the various branches of the facial nerve (VII), which — when the muscles are activated — send signals to the brain that you are smiling.

What muscle causes wrinkles across the forehead?

Forehead wrinkles are caused by the action of the frontalis muscle on the forehead. This muscle contracts when we raise our eyebrows. The raising of the frontalis muscle pulls the skin of the forehead up and causes forehead wrinkles which appear as lines across our forehead.

Which bones lie deep to the orbicularis oris?

Zygomaticus major and minor lift the corners of the mouth. Levator labii lies deep to orbicularis oculi at its origin from the maxilla just above the infraorbital foramen. It passes downward to insert into the upper lip and orbicu- laris oris.

How do you test for orbicularis oris?

Test the strength of the orbicularis oculi by gently trying to pry open the patient’s upper eyelid. Instruct him to puff out both cheeks. Check tension by tapping his cheeks with your fingers. Have the patient smile broadly and show his teeth, testing the lower face.

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