Muscles of Facial Expression Flashcards
Occipitofrontalis Action
Elevates eyebrows
Wrinkles skin on forehead
Retracts scalp
Occipitofrontalis Origin and Insertion
Origin:
- Frontal belly: epicranial opneurosis
- Occipital belly: lateral 2/3 of superior nuchal line
Insertion:
- Frontal belly: skin and subcutaneous tissue of eyebrows and forehead
- Occipital belly: epicranial aponeurosis
Occipitofrontalis extra info
Joined via the epicranial aponeurosis
Orbicularis Oculi Action
Closes eyelids…
Palpebral part: gently
Orbital part: tight/wink
Orbicularis Oculi Origin and Insertion
Origin:
- Medial orbital margin
- Medial palpebral ligament
- Lacrimal bone
Insertion:
Skin around margin of orbit; superior and inferior tarsal plates in eyelids
Orbicularis Oculi extra info
Sphincter around the eyes
Buccinator Action
Presses cheek against molar teeth
Resists distention of cheeks when blowing
Buccinator Origin and Insertion
Origin:
Alveolar processes of maxilla and mandible
Insertion:
Angle of mouth and orbicularis oris
Orbicularis Oris Action
Holds lips closed
Compresses and protrudes lips
Orbicularis Oris Origin and Insertion
Origin:
Maxilla and mandible bones, angles of mouth
Insertion:
Mucous membranes of lips
Orbicularis Oris extra info
Sphincter of the mouth
Platysma Action
Depresses mandible
Tenses skin of inferior face and neck
Platysma Origin and Insertion
Origin:
Subcutaneous fascia of the supra and infraclavicular regions
Insertion:
Mandible, skin of cheek and lower lip
Platysma extra info
Contained within the subcutaneous tissue of the neck
Muscles of Facial Expression nerve supply
Facial Nerve (Cranial Nerve VII)
