External Cranium Face - Face Muscles Flashcards
Occipitofrontalis: Front Belly Origin
Epicranial aponeurosis
Occipitofrontalis: Front Belly Insertion
Skin and subcutaneous tissue of eyebrows and forehead
Occipitofrontalis: Front Belly Action
Elevates eyebrows and wrinkles skin of forehead; protracts scalp (indicating surprise or curiosity)
Occipitofrontalis: Occipital Belly Origin
Lateral two thirds of superior nuchal line
Occipitofrontalis: Occipital Belly Insertion
Epicranial aponeurosis
Occipitofrontalis: Occipital Belly Action
Retracts scalp; increasing effectiveness of frontal belly
Orbicularis Oculi Origin
Medial orbital margin; medial palpebral ligament; lacrimal bone
Orbicularis Oculi Insertion
Skin around margin of orbit; superior and inferior tarsal plates
Orbicularis Oculi Action
Closes eyelids: palpebral part does so gently; orbital part tightly (winking)
Orbicularis Oris Origin
Medial maxilla and mandible; deep surface of perioral skin; angle of mouth (modiolus)
Orbicularis Oris Insertion
Mucous membrane of lips
Orbicularis Oris Action
Tonus closes oral tissue; phasic contraction comressess and protrudes lips (kissing) or resists distension (when blowing)
Levator Labii Superioris Origin
Infra-orbital margin(maxilla)
Levator Labii Superioris Insertion
Skin of upper lip
Levator Labii Superioris Action
Part of dilators of mouth; retract (elevate) and /or evert upper lip; deepen nasolabial sulcus (showing sadness)
Depressor Labii Inferioris Origin
Platysma and anterolateral body of mandible
Depressor Labii Inferioris Insertion
Skin of lower lip
Depressor Labii Inferioris Action
Part of dilators of mouth; (depresses) and/or everts lower lip (pouting, sadness)
Zygomaticus Major Origin
Lateral aspect of zygomatic bone
Zygomaticus Major Insertion
Angle of mouth (modiolus)
Zygomaticus Major Action
Part of dilators of mouth; elevate labial commissure - bilaterally to smile (happiness); unilaterally to sneer (disdain)
Risorius Origin
Parotid fascia and buccal skin (highly variable)
Risorius Insertion
Angle of mouth (modiolus)
Risorius Action
Part of dilators of mouth; depresses labial commissure bilaterally to frown (sadness)
Depressor Anguli Oris Origin
Anterolateral base of mandible
Depressor Anguli Oris Insertion
Angle of mouth (modiolus)
Depressor Anguli Oris Action
Part of dilators of mouth; depresses labial commissure bilaterally to frown (sadness)
Mentalis Origin
Body of mandible (anterior to roots of inferior incisors)
Mentalis Insertion
Skin of chin (mentolabial sulcus)
Mentalis Action
Elevates and protrudes lower lip; elevates skin of chin (showing doubt)
Platysma Origin
Subcutaneous tissue of infraclavicular and supraclavicular regions
Platysma Insertion
Base of mandible; skin of cheek and lower lip; angle of mouth (modiolus); orbicularis oris
Platysma Action
Depresses mandible (against resistance); tenses skin of inferior face and neck (conveying tension and stress)
Buccinator (cheek muscle) Origin
Mandible, alveolar processes of maxilla and mandible, pterygomandibular raphe
Buccinator (cheek muscle) Insertion
Angle of mouth (modiolus); orbicularis oris`
Buccinator (cheek muscle) Action
Presses cheek against molar teeth; works with tongue to keep food between occlusal surfaces and out of oral vestibule; resists distension (when blowing)
