-
Name of muscle: Platysma
-
-
Origin: Fascia over deltoid and pectoralis major muscles
-
Insertion: Mandible, blends with muscles around angle of mouth, and skin of lower face.
-
Action: Draws outer part of lower lip inferiorly and posteriorly as in pouting; depresses mandible.
-
-
Name of muscle: Mentalis
-
-
Origin: Mandible
-
Insertion: Skin of chin
-
Action: Elevates and protrudes lower lip and pulls skin of chin up, as in pouting.
-
-
Name of muscle: Orbicularis oris
-
-
Origin: Muscle fibers surrounding opening of mouth
-
Insertion: Skin at corner of mouth
-
Action: Closes and protrudes lips, as in kissing; compresses lips against teeth; and shapes lips during speech.
-
-
Name of muscle: Corrugator supercilii
-
-
Origin: Medial end of superciliary arch of frontal bone.
-
Insertion: Skin of eyebrow.
-
Action: Draws eyebrow inferiorly and wrinkles skin of forehead vertically as in frowning.
-
-
Name of muscle: Orbicularis oculi
-
-
Origin: Medial wall of orbit.
-
Insertion: Circular path around orbit.
-
Action: Closes one eye
-
-
Name of muscle: Frontal belly
-
-
Origin: Epicranial aponeurosis.
-
Insertion: Skin superior to supraorbital margin.
-
Action: Draws scalp anteriorly, raises eyebrows, and wrinkles skin of forehead horizontally as in look of surprise.
-
Reference
Tortora, G. J., & Derrickson, B. (2017). Principles of anatomy & physiology. Fifteenth edition; Wiley Loose-Leaf Print Companion. Hoboken, New Jersey, John Wiley & Sons, Inc.