Name the muscle that may cause the following facial expression and write down its origin, insertion and action.
- Muscle: Platysma
- Origin: Fascia over deltoid and pectoralis major muscles
- Insertion: Mandible, blends with muscles around angle of mouth and skin of lower face
- Action: Draws outer part of lower lip inferiorly and posteriorly as in pouting; depresses mandible
- Muscle: Mentalis
- Origin: Mandible
- Insertion: Skin of chin
- Action: Elevates and protrudes lower lip and pulls skin of chin up, as in pouting
- Muscle: Orbicularis oris
- Origin: Muscle fibers surrounding opening of mouth
- Insertion: Skin at corner of mouth
- Action: Closes and protrudes lips, as in kissing; compresses lips against teeth; and shapes lips during speech
- Muscle: Corrugator supercilii
- Origin: Medial end of superciliary arch of frontal bone
- Insertion: Skin of eyebrow
- Action: Draws eyebrow inferiorly and wrinkles skin of forehead vertically as in frowning
- Muscle: Orbicularis oculi
- Origin: Medial wall of orbit
- Insertion: Circular path around orbit
- Action: Closes the eye
- Muscle: Occipitofrontalis (Frontal Belly)
- Origin: Epicranial aponeurosis
- Insertion: Skin superior to supraorbital margin
- Action: Draws scalp anteriorly, raises eyebrows, and wrinkles skin of forehead horizontally as in look of surprise