Muscles LAB 2 Flashcards
Frontalis Belly, Epicranius
Action: pulls scalp forward; wrinkles forehead and raises eyebrows
Innervation: Temporal branches of facial nerve
Corrugator Supercilii
Action: Draws eyebrow medial and down (forms vertical furrow between eyebrows)
Innervation: Temporal branches of facial nerve
Superior Auricular
Action: N/A
Innervation: temporal branches of facial nerve
Temporoparietalis
Action: N/A
Innervation: temporal branches of facial nerve
Orbital Part, Orbicularis Oculi
Action: N/A
Innervation: temporal and zygomatic branches of facial nerve
Peripheral Part, Orbicularis Oculi
Action: N/A
Innervation: temporal and zygomatic branches of facial nerve
Procerus
Action: depresses eyebrow medially
Innervation: Superior buccal branches of facial nerve
Compressor Naris
Action: compress cartilage at bridge of nose
Innervation: Superior buccal branches of facial nerve
Dilatator Naris
Action: widens, dilates nostrils and anterior nasal aperture
Innervation: superior buccal branches of facial nerve
Depressor Septi
Action: widens nostrils
Innervation: superior buccal branches of facial nerve
Levator Labii Superioris
Action: raises and everts upper lip
Innervation: buccal branches of facial nerve
Levator Labii Superioris Alaeque Nasi
Action: raises and everts upper lip; dilates nostril
Innervation: buccal branches of facial nerve
Zygomaticus Minor
Action: raises upper lip; produces nasolabial groove
Innervation: buccal branches of facial nerve
Zygomaticus Major
Action: draws angle of mouth up and out
Innervation: buccal branches of facial nerve
Levator Anguli Oris
Action: raises angle of mouth; produces nasolabial groove
Innervation: buccal branches of facial nerve
Buccinator
Action: compress cheeks against teeth
Innervation: buccal branches of facial nerve
Orbicularis Oris
Action: close mouth; purse and protrude lips
Innervation: buccal and mandibular branches of facial nerve
Risorius
Action: draws back angle of mouth
Innervation: buccal and mandibular branches of facial nerve
Mentalis
Action: raises and protrudes lower lip
Innervation: mandibular branches of facial nerve
Depressor Labii Inferioris
Action: draws lower lip down
Innervation: mandibular branches of facial nerve
Depressor Anguli Oris
Action: draws corner of mouth down and out
Innervation: mandibular branches of facial nerve
Levator Palpebra Superioris
Action:elevates upper eyelid
Innervation: oculomotor nerve
Superior Rectus
Action: elevates and adducts the cornea; intorsion
Innervation: oculomotor nerve
Inferior Rectus
Action: depress and adducts the cornea; extorsion
Innervation: Oculomotor nerve
Medial Rectus
Action: adducts cornea
Innervation: Oculomotor nerve
Inferior Oblique
Action: elevates and abducts the cornea; extorsion
Innervation: Oculomotor nerve
Lateral Rectus
Action: abducts cornea
Innervation: Abducent nerve
Superior Oblique
Action: depress and abducts cornea; intorsion
Innervation: Trochlear nerve
Posterior Auricular
Action: N/A
Innervation: posterior auricular branch of facial nerve
Occipitalis Belly, Epicranius
Action: N/A
Innervation: posterior auricular branch of facial nerve
Temporalis
Action: elevate and retract mandible
Innervation: anterior and posterior deep temporal branches, mandibular division, trigeminal nerve
Masseter
Action: elevate and protract mandible
Innervation: masseteric branch, mandibular division, trigeminal nerve
Medial Pterygoid
Action: elevate and protract mandible; assist in gliding or rotary movement
Innervation: medial pterygoid branch, mandibular division, trigeminal nerve
Lateral Pterygoid
Action: protracted mandible; pulls disc forward; depress chin and assist in gliding or rotary movement
Innervation: later Pterygoid branch, mandibular division, trigeminal nerve
Anterior Scalene
Action: N/A
Innervation: ventral rami C2-C6
Middle Scalene
Action: N/A
Innervation: ventral rami C3-C8
