Face, Temporal, and Infratemporal

Orbicularis Oculi - Peripheral Innervation

Facial nerve

Orbicularis Oculi - Action

Forcefully close eyes, encourages flow of tears, squint

Frontalis - Peripheral Innervation

Facial nerve

Frontalis - Action

Elevates eyebrows, wrinkle forehead

Corrugator - Peripheral Innervation

Facial nerve

Corrugator - Action

Knits eyebrows together

Levator Palpebrae Superioris - Peripheral Innervation

Oculomotor nerve

Levator Palpebrae Superioris - Action

Elevates upper eyelid, continuously active (agonist of orbicularis oculi)

Nasalis - Peripheral Innervation

Facial nerve

Nasalis - Action

Compresses and flares nostril, draws nostril down

Procerus - Peripheral Innervation

Facial nerve

Procerus - Action

Draws medial part of eyebrow inferiorly

Orbicularis Oris - Peripheral Innervation

Facial nerve

Orbicularis Oris - Action

Oral sphincter, lip protrusion, compression, mastication, and pucker

Levator Labii Superioris - Peripheral Innervation

Facial nerve

Levator Labii Superioris - Action

Raises and everts upper lip

Levator Labii Superioris Alaque Nasi - Peripheral Innervation

Facial nerve

Levator Labii Superioris Alaque Nasi - Action

Elevates alar cartilage of nose and upper lip

Levator Anguli Oris - Peripheral Innervation

Facial nerve

Levator Anguli Oris - Action

Elevates corner of mouth

Zygomaticus Major & Minor - Peripheral Innervation

Facial nerve

Zygomaticus Major & Minor - Action

Pulls mouth corners upward and outward, smile

Risorius - Peripheral Innervation

Facial nerve

Risorius - Action

Pulls mouth corners upward and outward (backward), smile

Depressor Anguli Oris - Peripheral Innervation

Facial nerve

Depressor Anguli Oris - Action

Depresses corner of mouth

Depressor Labii Inferioris - Peripheral Innervation

Facial nerve

Depressor Labii Inferioris - Action

Draws lips inferiorly and laterally

Mentalis - Peripheral Innervation

Facial nerve

Mentalis - Action

Raise and protrude lower lip; pout

Platysma - Peripheral Innervation

Facial nerve

Platysma - Action

Tenses skin of neck, draws corners of mouth inferiorly, assist in depressing mandible

Buccinator - Peripheral Innervation

Facial nerve

Buccinator - Action

Aids in mastication and swallowing, press cheeks against molar teeth during chewing, whistling/sucking

Masseter - Origin

Inferior border & medial surface of zygomatic arch

Masseter - Insertion

Lateral surface of ramus of mandible & coronoid process

Masseter - Peripheral Innervation

Mandibular Division of Trigeminal Nerve (CN V3)

Masseter - Action

Elevates & protrudes mandible; deep fibers retrude

Temporalis - Origin

Temporal fossa & deep surface of temporal fascia

Temporalis - Insertion

Tip & medial surface of coronoid process & ramus of mandible

Temporalis - Peripheral Innervation

Mandibular Division of Trigeminal Nerve (CN V3)

Temporalis - Action

Elevates mandible; posterior fibers retrude mandible after protrusion

Lateral Pterygoid - Origin

Superior head: infratemporal surface & crest of greater wing of sphenoid bone; Inferior head: lateral surface of lateral pterygoid plate

Lateral Pterygoid - Insertion

Both heads insert at neck of mandible; superior head also inserts to anterior part of articular disc & capsule of TMJ

Lateral Pterygoid - Peripheral Innervation

Mandibular Division of Trigeminal Nerve (CN V3)

Lateral Pterygoid - Action

Acting bilaterally, protrude mandible; Acting alone & alternately, produce side to side movements of mandible; superior head works eccentrically to control posterior movement of disc during closing

Medial Pterygoid - Origin

Deep head: medial surface of lateral pterygoid plate; Superficial head: tuberosity of maxilla

Medial Pterygoid - Insertion

Medial surface of ramus of mandible

Medial Pterygoid - Peripheral Innervation

Mandibular Division of Trigeminal Nerve (CN V3)

Medial Pterygoid - Action

Acting bilaterally, elevate mandible & help to protrude mandible; Acting alternately, produce grinding motion