Cranial Nerves

Question 1

CN 1

Answer 1

OLFACTORY
Sensory
Sense of smell
Applies to appetite
Nuclei location: Mucous of nasal cavity

Question 2

CN 2

Answer 2

OPTIC
Sensory
Vision
Nuclei location: Retina of the eye

Question 3

CN 3

Answer 3

OCCULOMOTOR
Motor
Bilateral innervation
Eye movements, lifts eyelid, pupillary reflexes
Nuclei location:Midbrain

Question 4

CN 4

Answer 4

TROCHLEAR
Motor
Bilateral innervation
Eye movements
Nuclei location: Midbrain

Question 5

CN 5

Answer 5

TRIGEMINAL
Sensory + Motor
Bilateral innervation (sensation is contralateral)
Sensation from face/head, sensation to anterior 2/3 tongue, anterior 1/2 pinna, ear drum
Motor- chewing muscles, soft palate, Tensor tympani
Nuclei location: Midbrain, pons, medulla

Question 6

CN 7

Answer 6

FACIAL
Sensory + Motor
Upper face= bilateral, lower face= contralateral
Sensation: Taste from anterior 2/3 of tongue, sensation to part of ear canal
Motor- muscles of facial expression, stapedius, hyoid elevation
Other- Saliva, tear production
Nuclei location: Medulla, pons

Question 7

CN 8

Answer 7

VESTIBULOCOCHLEAR
Sensory
Audition, balance, vestibulo-ocular reflex
Nuclei location: medulla, pons

Question 8

CN 9

Answer 8

GLOSSOPHARYNGEAL
Sensory + Motor
Bilateral innervation
Sensory: Sensation to middle ear, upper pharynx, taste, sensation for posterior 1/3 tongue
Motor: Elevates pharynx, gag reflex
Nuclei location: Medulla, pons

Question 9

CN 10

Answer 9

VAGUS
Sensory + Motor
Bilateral innervation
Sensory: Sensation from pharynx, taste, from epiglottis/pharynx
Motor: Movement of pharynx and larynx (swallowing and phonation)
Other: Parasympathetic innervation to the heart, lungs, digestive tract

Question 10

CN 11

Answer 10

SPINAL ACCESSORY
Motor
Bilateral innervation
Helps head turn, raise shoulders
Nuclei location: Cervical spinal cord

Question 11

CN 12

Answer 11

HYPOGLOSSAL
Motor
Contralateral innervation
Tongue movements
Nuclei location: Medulla