muscles

occipitofrontalis

origin: 4 bellies (2 occipital, 2 frontal)

insertion: epicranial aponeurosis/ galea aponeuratica

innervation: CN VII

action: move scalp forward and back, raise eyebrows

epicranial aponeurosis

insertion for occipitofrontalis

orbiularis oculi

origin: medial palpebral ligament

insertion: lateral palpebral raphe

innervation: facial nerve CN VII

action: close eyelids

corrugator supercili

innervation: facial nerve CN VII

action: draw eyebrows medially and inferiorly (angry face)

Compressor nasi

innervation: CN VII facial nerve

action: elevate corners of nostrils (angry face)

Muscles in “angry face”

corrugator supercili- furrow eyebrows

compressor nasi- elevate nostrils

dilator naris

innervation: CN VII facial nerve

action: dilate nares

Procerus

innervation: CN VII facial nerve

action: wrinkle nose

orbicularis oris

innervation: CN VII facial nerve

action: compress lips together, keep food between teeth during mastication

buccinator

origin: mandible and maxilla

insertion: orbicularis oris

innervation: CN VII facial nerve

action: smiling, food between teeth during mastication, active during sucking blowing, whistling

Muscles innervated by CN VII

buccinator

occipitofrontalis

orbicularis oris

orbicularis occuli

procerus

compressor nasi

corrugator supercili

dilator nasi

Masseter

origin: zygomatic arch

insertion: lateral mandible

innervation: mandibular division of trigemenal nerve (CN V)

action: elevate mandible to occlude teeth

temporalis

origin: floor of temporal fossa

insertion: coronoid process of mandible

innervation: mandibular division of trigemenal nerve (CN V)

action: elevate and retract mandible

lateral pterygoid

innervation: mandibular division of trigemenal nerve (CN V)

action: depress, protrude, and side to side movement of mandible

medial pterygoid

innervation: mandibular division of trigemenal (CN V)

action: elevate mandible

levator anguli oris

action: aid in grinning

mentalis

action: elevate and protrude lower lip

platysma

action: depress mandible

muscles innervated by CN V

masseter

temporalis

medial pterygoid

lateral pterygoid