|
Muscle |
Origin |
Insertion |
Action |
|
Subcutaneous tissue of infraclavicular and supraclavicular regions |
Base of mandible; skin of cheek and lower lip; angle of mouth (modiolus); or bicularis oris |
Depresses mandible (against resistance); tenses skin of inferior face and neck (conveying tension and stress) |
|
Body of mandible (anterior to roots of inferior incisors) |
Skin of chin (mentolabial sulcus) |
Elevates and protrudes lower lip; elevates skin of chin (showing doubt) |
|
Medial maxilla and mandible; deep surface of perioral skin; angle of mouth (modiolus) |
Mucous membrane of lips |
Tonus closes oral fissure; phasic contraction compresses and protrudes lips (kissing) or resists distension (when blowing) |
|
Medial end of superciliary arch |
Skin superior to middle of supraorbital margin and superciliary arch |
Draws eyebrow medially and inferiorly, creating vertical wrinkles above nose (demonstrating concern or worry) |
|
Medial orbital margin; medial palpebral ligament; lacrimal bone |
Skin around margin of orbit; superior and inferior tarsal plates |
Closes eyelids: palpebral part does so gently; orbital part lightly (winking) |
|
Epicranial aponeurosis |
Underneath the skin of the forehead |
Elevation of both eyebrows, causing wrinkles on the skin of the forehead |