Muscle actions Flashcards
A: Frontalis Belly, Epicranius
pulls scalp forward; wrinkles forehead & raises
eyebrows
A: Occipitalis Belly, Epicranius
pulls scalp backward
A: Procerus
depress eyebrows medially
A: Compressor Naris
compress cartilage at bridge of nose
A: Dilatator Naris
widens, dilates nostrils & anterior nasal aperture
A: Depressor Septi
widens nostril
A: Corrugator Supercilii
draws eyebrow medial & down (forms vertical furrow
between eyebrows)
A: Levator Labii Superioris
raises & everts upper lip
A: Levator Labii Superioris Alaeque
Nasi
raises & everts upper lip; dilates nostril
A: Zygomaticus Minor
raises upper lip; produces nasolabial groove
A: Zygomaticus Major
draws angle of mouth up and out
A: Levator Anguli Oris
raises angle of mouth; produces nasolabial groove
A: Orbicularis Oris
close mouth; purse & protrude lips
A: Buccinator
compress cheeks against teeth
A: Risorius
draws back angle of mouth
A: Mentalis
raises & protrudes lower lip
A: Depressor Labii Inferioris
draws lower lip down
A: Depressor Anguli Oris
draws corner of mouth down & out
A: Levator Palpebra Superioris
elevates upper eyelid
A: Superior Rectus
elevate & adduct the cornea; intorsion
A: Inferior Rectus
depress & adduct the cornea; extorsion
A: Medial Rectus
adducts cornea
A: Lateral Rectus
abducts cornea
A: Superior Oblique
depress & abduct the cornea; intorsion
A: Inferior Oblique
elevate & abduct the cornea; extorsion
A: Temporalis
elevate & retract mandible
A: Masseter
elevate & protract mandible
A: Medial Pterygoid
elevate & protract mandible; assists in gliding or rotatory movement
A: Lateral Pterygoid
protracts mandible; pulls disc forward; depress chin & assist in gliding or rotatory movement
