Figure 3-16. - Muscle anatomy of mastication.
Table 3-3. - Muscles of Facial Expression
Muscle | Origin | Insertion | Description |
Orbicularis oris | Encircles the mouth (no attachement to bone) | Corners of the mouth | Located between the skin and mucous membranes of the lips. Makes lips close and pucker. |
Buccinator | Alveolar process of maxilla and mandible | Orbicularis oris at the corner of the mouth | Located in the walls of the cheeks, holds food in contact with teeth when chewing, and assists in blowing air out of the mouth. |
Mentalis | Mandible | Skin of chin | Raises and wrinkles the skin of the chin and decreases and protrudes the lower lip. |
Zygomaticus Major | Zygomatic bone | Orbicularis oris (angle of the mouth) | Raises the corner of the mouth when smiling. |