Anatomy - MOINA of Facial Expressions

origin of orbicularis oculi

• orbital portion: nasal process of frontal bone

• palpebral portion: palpebral ligament

• lacrimal portion: lacrimal crest of lacrimal bone

insertion of orbicularis oculi

circumferentially around orbit meeting at the origin

innervation of orbicularis oculi

zygomatic branch of facial nerve (CN VII)

action of orbicularis oculi

• closes eye tightly, squinting of the eye

• depresses upper eyelid, elevates lower eyelid (palpebral part)

origin of occipitalis

lateral 2/3 of superior nuchal line & EOP (external occipital protuberance)

insertion of occipitalis

galea aponeurotica

innervation of occipitalis

posterior auricular branch of facial nerve (CN VII)

action of occipitalis

draws back scalp to raise eyebrows & wrinkle brow (surprise)

origin of frontalis

galea aponeurotica

insertion of frontalis

skin & fascia above nose & eyes

innervation of frontalis

temporal branch of facial nerve (CN VII)

action of frontalis

draws scalp posteriorly to raise eyebrows & wrinkle brow (surprise)

origin of orbicularis oris

modiolus (just lateral to angle of mouth)

insertion of orbicularis oris

• circumferentially around mouth

• blends with other muscles

innervation of orbicularis oris

facial nerve (CN VII)

action of orbicularis oris

closes mouth; protrudes lips (puckering of lips)

origin of levator anguli oris

below infraorbital foramen of maxilla

insertion of levator anguli oris

modiolus (near angle of mouth)

innervation of levator anguli oris

facial nerve (CN VII)

action of levator anguli oris

elevates angle(s) of mouth (smiling)

origin of buccinator

• maxilla & mandible (posterior alveolar process of both bones)

• pterygomandibular raphe

insertion of buccinator

modiolus (just lateral to the angle of the mouth)

innervation of buccinator

facial nerve (CN VII)

action of buccinator

compresses cheek(s)

origin of levator palpebrae superioris

lesser wing of sphenoid bone (anterior surface)

insertion of levator palpebrae superioris

upper eyelid (fascia & skin)

innervation of levator palpebrae superioris

oculomotor nerve (CN III)

action of levator palpebrae superioris

elevates upper eyelid

origin of procerus

nasal bone & cartilages

insertion of procerus

skin & fascia between eyebrows

innervation of procerus

superior buccal branches of facial nerve (CN VII)

action of procerus

• draws medial eyebrow downward (menacing expression)

• wrinkles skin of superior nose

origin of corrugator supercilii

frontal bone just above nose (lateral to glabella)

insertion of corrugator supercilii

skin of medial portion of eyebrows

innervation of corrugator supercilii

zygomatic branch of facial nerve (CN VII)

action of corrugator supercilii

draws eyebrows downward & medially (“thinker’s brow”)

origin of depressor anguli oris

• along oblique line of mandible

• lateral aspect of mental tubercle of mandible

insertion of depressor anguli oris

modiolus (near angle of mouth)

innervation of depressor anguli oris

facial nerve (CN VII)

action of depressor anguli oris

depresses angle(s) of mouth (frown)

origin of depressor labii inferioris

mandible (between symphysis & mental foramen)

insertion of depressor labii inferioris

skin & fascia of lower lip

innervation of depressor labii inferioris

facial nerve (CN VII)

action of depressor labii inferioris

• draws lower lip downward & laterally

• everts lower lip

origin of depressor septi nasi

incisive fossa of maxilla

insertion of depressor septi nasi

septum & alar cartilage of nose

innervation of depressor septi nasi

facial nerve (CN VII)

action of depressor septi nasi

constricts nostrils

origin of levator labii superioris

medial inferior orbital margin of maxilla

insertion of levator labii superioris

upper lip muscles

innervation of levator labii superioris

facial nerve (CN VII)

action of levator labii superioris

• elevates upper lip

• everts upper lip

origin of levator labii superioris alaeque nasi

frontal process of maxilla

insertion of levator labii superioris alaeque nasi

• lateral slip: upper lip muscles

• medial slip: alar cartilage of nose

innervation of levator labii superioris alaeque nasi

facial nerve (CN VII)

action of levator labii superioris alaeque nasi

• elevates upper lip

• flares nostrils

• everts upper lip

origin of mentalis

incisive fossa of mandible

insertion of mentalis

skin & fascia of chin

innervation of mentalis

facial nerve (CN VII)

action of mentalis

• elevation of lower lip

• everts lower lip

• wrinkles skin of chin

origin of nasalis

• transverse part: maxilla (lateral to nose)

• alar part: maxilla, superior to canine alveolar process

insertion of nasalis

• transverse part: opposite side nasalis over upper cartilage of nose

• alar part: alar cartilage of nose (nasal wing)

innervation of nasalis

facial nerve (CN VII)

action of nasalis

flares nostrils (particularly in forced respiration)

origin of platysma

subcutaneous fascia (over deltoid-pectoral region)

insertion of platysma

mandible & subcutaneous fascia of lower face

innervation of platysma

facial nerve (CN VII)

action of platysma

• tenses skin over lower neck (creates ridge in skin)

• depress mandible & lower lip

origin of risorius

parotid fascia (superficial to masseter)

insertion of risorius

modiolus (near angle of mouth)

innervation of risorius

facial nerve (CN VII)

action of risorius

draws angles of mouth laterally (false smile)

origin of zygomaticus major

zygomatic bone (anterior to zygomatic-temporal suture)

insertion of zygomaticus major

modiolus (near angle of mouth)

innervation of zygomaticus major

facial nerve (CN VII)

action of zygomaticus major

• elevates angle of mouth (smiling)

• pulls angle of mouth laterally

origin of zygomaticus minor

zygomatic bone (posterior to zygomaticomaxillary suture)

insertion of zygomaticus minor

skin, fascia & muscles of upper lip

innervation of zygomaticus minor

facial nerve (CN VII)

action of zygomaticus minor

• elevates upper lip (smile)

• everts upper lip