1.
MUSCLE: Platysma
ORIGIN: Fascia over deltoid and pectoralis major muscles
INSERTION: Base of mandible; skin of cheek and lower lip; angle of mouth; orbicularis oris
ACTION: Depresses mandible; Draws outer part of lower lip inferiorly and posteriorly
2.
MUSCLE: Mentalis
ORIGIN: mandible
INSERTION: Skin of chin
ACTION: Elevates and protrudes lower lip; elevates skin of chin
3.
MUSCLE: Orbicularis oris
ORIGIN: angle of mouth
INSERTION: Skin at corner of mouth
ACTION: compresses and protrudes lips (kissing); and shapes lips during speech
4.
MUSCLE: Corrugator supercilii
ORIGIN: Medial end of superciliary arch
INSERTION: Skin of eyebrow
ACTION: Draws eyebrow inferiorly and creates vertical wrinkles on the forehead
5.
MUSCLE: Orbicularis oculi
ORIGIN: Medial orbital margin
INSERTION: Circular path around orbit
ACTION: Closes eye
6.
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