Image 1
Muscle: Platysma
Origin: Fascia over deltoid and pectoralis major muscles
Insertion: Mandible
Action: Moves the outer lip down and back, like in a pout, and lowers the jaw
Image 2
Muscle: Depressor labii inferioris
Origin: Mandible
Insertion: Skin of lower lip
Action: Depresses lower lip
Image 3
Muscle: Orbicularis oris
Origin: muscle fibers surrounding opening of mouth
Insertion: skin at corner of mouth
Action: closes and protrudes lips, compresses lips against teeth, shapes lips during speech
Image 4
Muscle: corrugator supercilii
Origin: medial end of superciliary arch of frontal bone
Insertion: skin of eyebrow
Action: draws eyebrows inferiorly and wrinkles skin of forehead vertically
Image 5
Muscle: orbicularis oculi
origin: medial wall of orbit
insertion: circular path around orbit
action: close eye
image 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