Cranial nerves Flashcards
Functions of CN I
Sense of smell
Where CN I leaves the skull
Cribiform plate
Sign of damage to CN I
Anosmia
Functions of CN II
Vision
Where CN II leaves the skull
Optic canal
Sign of damage to CN II
Visual field changes
Functions of CN III
Motor: Medial, Superior, Inferior recti and inferior oblique
PNS: Constrictor pupillae
Where CN III leaves the skull
Superior orbital fissure
Sign of damage to CN III
Eye faces down and out, Pupil dilated
Functions of CN IV
Motor: Superior oblique
Where CN IV leave the skull
Superior orbital fissure
Sign of damage to CN IV
Can’t look down when eye is adducted
Function of CN V1
Sensation: Forehead, Bridge of nose
Where CN V1 leaves the skull
Superior orbital fissure
Function of CN V2
Sensation: Cheeks, Upper jaw
Where CN V2 leaves the skull
Foramen rotundum
Function of CN V3
Sensation: Lower jaw, Anterior of the ears
Motor: Muscles of mastication
Where CN V3 leaves the skull
Foramen ovale
Signs of damage to CN V
Jaw deviation, Loss of sensation
Function of CN VI
Motor: Lateral rectus
Where CN VI leaves the skull
Superior orbital fissure
Signs of damage to CN VI
Can’t look out
Function of CN VII
Sensation: Auricle
Motor: Muscles of facial expression
Special sense: Taste anterior 2/3s of the tongue
Where CN VII leaves the skull
Stylomastoid foramen
