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Epicranius
(Frontal Belly)
- Action- Raises the eyebrows; wrinkles the skin of the forehead
- Origin- Occipital bone by way of Galea Aponeurosis
- Insertion- Skin of eyebrows and bridge of nose
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Orbicularis Oculi
- Action- Closes the eye
- Origin- Frontal and maxillary bones, margin of orbit
- Insertion- Skin around the eye; circles the orbit
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Zygomaticus major
- Action- Raises the angle of the mouth (smile)
- Origin- Zygomatic bone
- Insertion- Skin and muscles about the angle of the mouth
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Orbicularis oris
- Action- closes and protrudes the lips (kissing action)
- Origin- Maxilla and Mandible
- Insertion surrounding the mouth, lips
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Buccinator
- Action- Compresses cheek; pulls corner of the mouth laterally
- Origin- Mandible and Maxillary bone
- Insertion- Orbicularis oris and skin at the angle of the mouth
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Masseter
- Action- Raises the Mandible, closing the jaw
- Origin- Zygomatic arch, Maxilla
- Insertion- Manible
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Temporalis
- Action- Raises the Mandible, closing the jaw
- Origin- Temporal bone
- Insertion- Coronoid process of Mandible
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Platysma
- Action- Depresses the Mandible; draws the angle of the mouth downward; tightens the skin of neck
- Origin- Fascia of the upper chest
- Insertion- Mandible and skin of chin and cheek
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Sternocleidomastoid
- Action- Pulls head to one side, pulls head toward chest, or raises sternum
- Origin- Sternum and Clavivle
- Insertion- Mastoid process of Temporal bone
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