| Term | Definition |
|---|
| Frontalis | Origin: Galea aponeurotica. Insertion: skin superior to supraorbital margin. Action: draws scalp anteriorly elevates eyebrows, wrinkles skin of forehead horizontally. |
| Occipitals | Origin: occipital bone and mastoid process of temporal bone. Insertion: galea aponeurotica. Action: draws scalp posteriorly. |
| Orbicularis Oris | Origin: muscle fibers surrounding opening of mouth. Insertion: skin at the corner of mouth. Action: closes lips, compresses lips against teeth, protrudes lips, shapes lips during speech. |
| Levator Labii Superioris | Origin: superior to infraorbital foramen of maxilla. Insertion: skin at angle of mouth and orbicularis oris. Action: elevates upper lip. |
| Depressor labii inferioris | Origin: mandible. Insertion: skin of lower lip. Action: depresses lower lip. |
| Buccinator | Origin: alveolar processes of maxilla and mandible and pterygomandibular raphe. Insertion: orbicularis oris. Action: compresses cheek, produces the action of sucking, causes cheek to cave in. (trumpet player) |
| Platysma | Origin: fascia over deltoid and pectoralis major. Insertion: mandible, muscles around angle of mouth, skin of lower face. Action: draws outer part of lower lip inferiorly as in pouting, depresses mandible. |
| Orbicularis Oculi | Origin: medial wall of orbit. Insertion: circular path around orbit. Action: closes eye. |
| Masseter | Origin: maxilla and zygomatic arch. Insertion: angle and ramus of mandible. Action: elevates mandible as in closing mouth, assists in side to side movement of mandible, protracts mandible. |
| Temporalis | Origin: parietal bone. Insertion: coronoid process and ramus of mandible. Action: elevates and retracts mandible, assists in side to side movement of mandible. |
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