Chapter 11, Part 1 Muscles of the Face

Insert into superficial fascia of skin Fig. 11.2a Superficial Deep Epicranial aponeurosis Epicranius Frontal belly of occipitofrontalis Facial expression muscles originate in superficial fascia or on skull bones Insert into superficial fascia of skin Procerus Corrugator supercilii Levator palpebrae superioris Orbicularis oculi Nasalis Levator labii superioris Zygomaticus minor Levator anguli oris (cut) Zygomaticus major Masseter Risorius Buccinator Depressor anguli oris Orbicularis oris Depressor labii inferioris Mentalis Platysma Sternocleidomastoid

Epicranius runs across top of head from forehead to back of skull Fig. 11.2a Superficial Deep Epicranial aponeurosis Epicranius runs across top of head from forehead to back of skull occipitofrontalis muscle with epicranial aponeurosis frontal belly of occipitofrontalis on forehead occipital belly on occipital bone Epicranius Frontal belly of occipitofrontalis

Corrugator supercilii is deep to occipitofrontalis Fig. 11.2a Superficial Deep Corrugator supercilii is deep to occipitofrontalis draws eyebrows together creates vertical wrinkles above nose Procerus is vertical across bridge of nose wrinkles the nose nasalis elevates corners of nostrils “flares the nostrils” Procerus Corrugator supercilii Nasalis

Levator palpebrae superioris raises eyelid Fig. 11.2a Superficial Deep Levator palpebrae superioris raises eyelid opens the eye orbicularis oculi surrounds orbit of eye closes eye (wink, blink, squint) Levator palpebrae superioris Orbicularis oculi

Orbicularis oris surrounds mouth Superficial Fig. 11.2a Deep Orbicularis oris surrounds mouth closes mouth, puckers lips depressor labii inferioris pulls lower lip down depressor anguli oris is “frown” muscle pulls corners of mouth down Depressor anguli oris Orbicularis oris Depressor labii inferioris

levator labii superioris extends from under eye to upper lip Fig. 11.2a Superficial Deep levator labii superioris extends from under eye to upper lip pulls upper lip up in snarl or sneer levator anguli oris pulls corner of mouth superiorly and laterally zygomaticus major and zygomaticus minor pull corner of mouth superiorly and laterally smile risorius pulls corner of mouth laterally Levator labii superioris Zygomaticus minor Zygomaticus major Risorius Platysma

mentalis attaches to lower lip Fig. 11.2a Superficial Deep mentalis attaches to lower lip protrudes lower lip (pout) platysma tenses skin of neck, pulls lower lip down buccinator compresses cheek against teeth masseter raises and lowers jaw Masseter Buccinator Mentalis Platysma

Fig. 11.3 Depressor anguli oris (frown) Orbicularis oculi (blink/close eyes) Zygomaticus major (smile) Orbicularis oris (close mouth/kiss) Frontal belly of occipitofrontalis (wrinkle forehead, raise eyebrows) Platysma (tense skin of neck)