- Muscle Name: Platysma
Origin: Fascia of deltoid and pectoralis major
Insertion: Mandible; skin and subcutaneous tissue of lower face
Action: Draws lower lip and angle of mouth downward in expressions of horror or surprise; may aid in opening mouth widely - Muscle Name: Mentalis
Origin: Incisive fossa of mandible
Insertion: Under theskin of the chin
Action: Elevates and wrinkles the chin, pulls lower lip out - Muscle Name: Orbicularis Oris
Origin: Skin surrounding lips
Insertion: Underneath the skin at the corners of the mouth
Action: Closes mouth, compresses and protrudes lip - Muscle Name: Corrugator supercilia
Origin: Frontal bone
Insertion: Skin underneath the eyebrow
Action: Lowers eyebrows - Muscle Name: Orbicularis Oculi
Origin: Medial bones of orbital margin
Insertion: Circumference of orbital margin
Action: Closes eyelids - Muscle Name: Occipitofrontalis
Origin: Epicranial aponeurosis
Insertion: Under the skin of the forehead
Action: Raises or furrows eyebrows