1/ Muscle: Platysma
Origin: Mandible
Insertion: Underneath skin of chin
Action: Protrusion of lower lip (e.g., pouting expression)
2/ Muscle: Depressor labi inferioris
Origin: Mandible
Insertion: Underneath skin of lower lip
Action: Lowering lower lip
3/ Muscle: Orbicularis oris
Origin: Tissue sorrounding lips
Insertion: Underneath skin at corners of the mouth
Action: Shaping of lips (as during speech)
4/ Muscle: Corrugator supercili
Origin: Frontal bone
Insertion: Skin underneath eyebrowsÂ
Action: Lowering eyebrows
5/ Muscle: Orbicularis oculi
Origin: Medial bones composing the orbit
Insertion: Circumference of orbit
Action: Closes eyelids
6/ Muscle: OccipitofrontalisÂ
Origin: Epicraneal aponeurosis
Insertion: Underneath skin of forehead
Action: Furrowing brow