Facial Muscles Flashcards
Occipitofrontalis muscle action
wrinkles forehead by raising eyebrows
Occipitofrontalis muscle innervation
facial nerve
Orbicularis Oculi action
closes eyes tightly
Orbicularis Oculi innervation
Facial Nerve
Superior levator palpebrae action
lifts upper eyelid
Superior levator palpebrae innervation
Oculomotor Nerve
Orbicularis Oris action
closes and protrudes lips, important in articulation of speech
Orbicularis Oris innervation
facial nerve
Buccinator action
presses cheeks firmly against teeth, active in smiling, keeps the cheeks taut thereby preventing it from folding and being injured during chewing
Buccinator innervation
facial nerve
Mylohyoid (suprahyoid muscle) action
elevates hyoid, floor of mouth, and tongue during swallowing and speaking
Geniohyoid (suprahyoid muscle) action
pulls hyoid anterosuperiorly
Stylohyoid (suprahyoid muscle) action
elevates and retracts hyoid
Digastric (suprahyoid muscle) action
elevates and steadies hyoid during swallowing and speaking
Sternohyoid (infrahyoid muscle) action
depresses hyoid after elevation during swallowing
Omohyoid (infrahyoid muscles) action
depresses, retracts, and steadies hyoid
sternothyroid (infrahyoid muscle) action
depresses hyoid and larynx
thyrohyoid (infrahyoid muscle) action
depresses hyoid and elevates larynx
Masseter action
elevates and protrudes mandible
masseter innervation
mandibular nerve (CN V3)
medial pterygoid action
Acting bilaterally, protrudes and elevates mandible
acting unilaterally, produces side to side movements
medial pterygoid innervation
mandibular nerve (CN V3)
temporalis action
elevates mandible
temporalis innervation
mandibular nerve (CN V3)
lateral pterygoid action
acting bilaterally, protrudes mandible
acting unilaterally, produces side to side grinding
lateral pterygoid innervation
mandibular nerve (CN V3)
