Muscle Actions Flashcards
What are the actions of the Frontal Belly of Occipitofrontalis?
1) Elevate eyebrows
2) Wrinkles skin of forehead
What are the actions of the Orbicularis Oculi?
Closes eyelids
What are the actions of the Platysma?
1) Depresses mandible
2) Tense skin of lower face and neck
What are the actions of the orbicularis oris?
1) Tonus closes oral fissure
2) Phasic contraction compresses and protrudes lips (kissing)
3) Resists distension (when blowing)
What are the actions of Levator anguli oris?
Elevates corners of mouth
What are the actions of depressor labii inferioris?
1) Depresses lower lip and/or
2) Everts lower lip
What are the actions of the depressor anguli oris?
1) Depresses angles of mouth
What are the actions of zygomaticus major?
Elevate angle of mouth
What are the actions of risorius?
Draw corner of mouth laterally
What are the actions of levator labii superioris?
1) Retract (elevate) upper lip
and/or
2) Evert upper lip
What are the actions of the masseter?
1) Elevate mandible,
2) Closing jaws
3) Limited protrusion of mandible
What is the action of the buccinator?
Keep cheek taut
What is the action of Inferior Oblique?
Abducts elevates laterally rotates eyeball
What is the action of Inferior Rectus?
Depresses adducts rotates eyeball laterally
What is the action of Lateral Rectus?
Abducts eyeball
What is the action of Levator Palpebrae Superioris?
Elevates superior eyelid
What is the action of Medial Rectus?
Adducts eyeball
What is the action of Orbicularis Oculi?
Closes eyelids
What is the action of Superior Oblique?
Abducts, depresses medially rotates eyeball
What is the action of Superior Rectus?
Elevates adducts rotates eyeball medially
What is the action of Tensor Tympani?
Pull handle of malleus medially to tense the tympanic membrane
What is the action of Stapedius?
Pulls stapes posteriorly, tightening anular ligament and reducing oscillatory range
What is the action of Levator Scapulae?
Elevate scapula, tilt glenoid cavity inferiorly
What is the action of Omohyoid?
Depresses, retracts, and steadies hyoid
What is the action of Platysma?
Depress mandible, tense skin of lower face and neck
What are the actions of the Scalenes?
- Anterior: flex head
- Middle: flex head and elevate 1st rib during forced inspiration
- Posterior: flex head and elevate 2nd rib during forced inspiration
What is the action of Semispinalis Capitis?
Extend head, extend and contralaterally rotate cervical/thoracic regions of vertebral column
What is the action of Splenius Capitis?
- Unilateral: laterally flex neck and rotate head to side of active muscles
- Bilateral: Extend head and neck
What is the action of subclavius?
Anchors and depresses clavicle
What is the action of Digastric?
Depresses mandible against resistance;
elevates and steadies hyoid during swallowing and speaking
What is the action of Longus Capitis?
Flex head
What is the action of Longus Colli?
Flexes neck, rotates contralaterally if acting unilaterally
What is the action of Mylohyoid?
Elevates hyoid, floor of mouth and tongue during swallowing and speaking, depresses mandible
What is the action of Omohyoid?
Depresses, retracts, and steadies hyoid
What is the action of Sternocleidomastoid?
Laterally flex neck, flex neck and rotate so turned superiorly toward contralateral side
What is the action of Sternohyoid?
Depress hyoid after elevation during swallowing
What is the action of Sternothyroid?
Depress hyoid and larynx
What is the action of Thyrohyoid?
Depresses hyoid and elevates larynx
What is the action of Masseter?
Elevate mandible closing jaw, limited protrusion of mandible
What is the action of Temporalis?
Elevates mandible closing jaw, posterior fibers retract mandible
What is the action of Buccinator?
Keep cheek taut
What is the action of Lateral Pterygoid?
Bilaterally protude mandible and depresses chin, unilaterally swings jaw to contralateral side
What is the action of Medial Pterygoid?
- Bilaterally elevates mandible; contributes to protrusion,
- Unilaterally produces smaller grinding movements
What is the action of Superior Pharyngeal Constrictor?
Constrict wall of pharynx during swallowing
What is the action of Middle Pharyngeal Constrictor?
Constrict wall of pharynx during swallowing
What is the action of Inferior Pharyngeal Constrictor?
Constrict wall of pharynx during swallowing
What is the action of Levator Veli Palatini?
Elevates soft palate during swallowing and yawning
What is the action of Palatoglossus?
Elevate posterior tongue and draws soft palate onto tongue
What is the action of Palatopharyngeus?
Tenses soft palate and pulls walls of pharynx superiorly, anteriorly, and medially during swallowing
What is the action of Salpingopharyngeus?
Elevate (shorten and widen) pharynx and larynx during speaking and swallowing
What is the action of Styloglossus?
Retrudes tongue
What is the action of Stylohyoid?
Depresses mandible against resistance when infrahyoid muscles fix or depress hyoid bone
What is the action of Stylopharyngeus
Elevate (shorten and widen) pharynx and larynx during speaking and swallowing
What is the action of Superior Pharyngeal Constrictor?
Constrict wall of pharynx during swallowing
What is the action of Tensor Veli Palatini?
Tenses soft palate and opens mouth of pharyngotympanic tube during swallowing and yawning
What is the action of Genioglossus?
Depress tongue, posterior part pulls tongue anteriorly for protrusion
What is the action of Hyoglossus?
Depress tongue; helps retrude tongue
What is the action of Styloglossus?
Retrudes tongue
What is the action of Geniohyoid?
Pulls hyoid anterosuperiorly; shortens floor of mouth; widens pharynx
What is the action of Cricothyroid?
Stretches and tenses vocal ligament
What is the action of Lateral Cricoarytenoid?
Adducts vocal folds
What is the action of Oblique Arytenoid?
Adducts arytenoid cartilages to close posterior rima glottides
What is the action of Posterior Cricoarytenoid?
Abducts vocal folds
What is the action of Thyroarytenoid?
Relaxes vocal ligament
What is the action of Transverse Arytenoid?
Adducts arytenoid cartilages to close posterior rima glottides
What is the action of Vocalis?
Relaxes posterior vocal ligament while maintaining (or increasing) tension of anterior part
What is the action of Palatoglossus?
Elevate posterior tongue or depress soft palate
