Head and neck muscle functions Flashcards
Buccinator muscle
Compresses cheeks
Depressor lablill infeirioris
Depresses lower lip
Levator labill superiloris
Elevates upper lip
Mentalis
Elevates and protrudes lower lip
Orbicularis Oris
Compresses, purse lips
Risorius
Draws corner of mouth to the side
Depressor anguli oris
Depress corner of mouth
Zygomaticus major
Retracts and elevates corner of mouth
Zygomaticus Minor
Retracts and elevates upper lip
Corrugator supercilli
Pulls skin inferiorly and anteriorly, wrinkle brow
Levator papebrae superloris
Elevate upper eyelid
Orbicularis oculi
Close eye.
Occipitofrontalis
Frontal belly: Raise eyebrows
Occipital belly: Tenses and retracts scalp
Platysma
Tense skin of neck, depresses mandible
Masseter
Elevates mandible and closes the jaw
Temporalis
Elevates mandible
Pterygoids
Medial: Elevates the mandible and closes the jaws, or performs lateral excursion.
Lateral: Opens jaws, protrudes mandible or performs lateral excursion.
Cricothyroid
Lengthen and increase tension on vocal cords
Sternocleidomastoid
Together: Flex head and neck
Individually: Laterally flex and rotate head
Scalenes
Both: Stabilize neck and elevate ribs in respiration
Individually: Lateral flexion of neck
Sternohyoid
Depress hyoid
Omohyoid
Depress and retract hyoid
Sternothyroid
Depress thyroid cartilage
Thyrohyoid
Depress hyoid bone or elevate thyroid cartilage
Stylohyoid
Raise and retract hyoid
Digastricus
Anterior - open mouth
Posterior - elevate hyoid
Mylohyoid
Elevate floor of mouth and tongue
Geniohyoid
Elevate hyoid and base of tongue
Arytenoids (transverse and oblique)
Adduct vocal cords, closing glottis
Lateral cricoarytenoids
Adduct vocal cords closing glottis
Posterior cricoarytenoids
Abduct vocal cords opening glottis
Thyroarytenoids
Shorten or relax vocal cords
Vocalis
Shorten or relax vocal cords.