Unit 2 Actions and Innervations Flashcards
stylohyoid
action: depress hyoid during swallowing
innervation: ansa cervicalis
omohyoid
action: depress and retract hyoid
innervation: ansa cervicalis
sternothyroid
action: depress hyoid and larynx
innervation: ansa cervicalis
Thyrohyoid
Action: depress hyoid and larynx
Innervation: C1 via hypoglossal nerve (CNXII)
Mylohyoid
Action: elevates hyoid and floor of mouth during swallowing
Innervation: CN V3
Geniohyoid
Action: pulls hyoid superiorly
Innervation: C1 ventral ramus via hypoglossal n
Stylohyoid
Action: elevates and retracts hyoid
Innervation: CN VII (facial)
Digastric
Action: depress mandible; steadies hyoid
Innervation: CNV anterior belly; CN VII posterior belly
Obicularis oculi
Action: closes eyelid
Innervation: CN VII
Occipitofrontalis
Action: raises eyebrows and wrinkles skin of forehead; protracts scalp (pulls it back)
Innervation: CNVII
Corrugator supercilli
Action: draws eyebrows medially down
Innervation: CNVII
Procerus
Action: depresses medial eyebrow; makes transverse wrinkle in forehead
Innervation: CNVII
Nasalis
action: widens nasal aperture
innervation: CNVII
levator labii superioris alaeque nasi (LLSAN)
action: everts upper lip and dilates nostrils
innervation: CNVII
levator labii superioris
action: elevates and everts upper lip
innervation: CNVII
zygomaticus major and minor
action: elevates upper lip, retracts buccal angle
innervation: CNVII
levator anguli oris
action: raise buccal angle
innervation: CNVII
buccinator
action: compresses cheeks against teeth, tighten cheeks when expelling air
innervation: CNVII
mentalis
action: wrinkles chin skin
innervation: CNVII
depressor labii inerioris
action: depresses and everts lower lip
innervation: CNVII
depressor anguli oris
action: depresses buccal angle
innervation: CNVII
obicularis oris
action: closes, purses, protrudes lips
innervation: CNVII
platysma
action: depresses mandible and tenses skin of neck
innervation: CNVII
risorius
action: pulls buccal angle laterally
innervation: CNVII
levator palpebrae superiorus
action: elevates upper eyelid
innervation: CN III (oculomotor)
medial rectus
action: adduction of eyeball
innervation: CN III (oculomotor)
lateral rectus
action: abduction of eyeball
innervation: CN VI (abducens)
superior rectus
action: elevates, adducts, medially rotates eyeball
innervation: CN III (oculomotor)
inferior rectus
action: depress, adducts, laterally rotates eyeball
innervation: CN III (oculomotor)
superior oblique
action: depress, abduct, medial rotate eyeball (down and out)
innervation: CNIV (trochlear)
inferior oblique
action: elevate, abduct, and medially rotate eyeball (up and out)
innervation: CN III (oculomotor)
