1. 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: depresses mandible
2. muscle: depressor labii inferioris
- origin: mandible
- insertion: skin of lower lip
- action: depresses (lowers) lower lip
- origin: muscle fibers surrounding opening of mouth
- insertion: skin at corner of mouth
- action: closes and protrudes lips (kissing)
- 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
- origin: medial wall of orbit
- insertion: circular path around orbit
- action: closes eye; winking
- 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