1.
Muscle - Platysma
Origin - Fascia covering the pectoralis muscle
Insertion - Mandible
Action - Contraction to pull down the corners of the mouth
2.
Muscle - Mentalis
Origin - Mandible
Insertion - Underneath skin of chin
Action - Protrusion of lower lip
3.
Muscle - Orbicularis oris
Origin - Maxilla, Mandible
Insertion - Skin surrounding lips
Action - Compresses and purses lips
4.
Muscle - Corrugator supercilli
Origin - Epicraneal aponeurosis
Insertion - Underneath skin of forehead
Action - Furrowing brow
5.
Muscle - Orbicularis oculi
Origin - Medial bones composing the orbit
Insertion - Circumference of orbit
Action - Closes eyelids
6.
Muscle - Occipitofrontalis
Origin - Epicranial aponeurosis
Insertion - Underneath skin of eyebrow
Action - Furrowing brow