Cranial nerves

Question 1

CN I

Answer 1

Name: Olfactory
Type: sensory
Nucleus: anterior olfactory      
      Function: smell       
      SVA 
Skull exit: cribiform plate of ethmoid bone

Question 2

CN II

Answer 2

Name: optic 
Type: sensory 
Nucleus: lateral geniculate 
       Function: vision 
       SSA
Skull exit: optic canal

Question 3

CN III

Answer 3

Name: oculomotor
Type: motor
Oculomotor nucleus:
Function: eye movements (addiction elevation, depression, extortion)-extra ocular muscles with except for: lateral rectus & superior oblique
GSE
Edinger Westphal:
Function: mediates pupillary reflex (constriction)
GVE
Skull exit: superior orbital fissure, midbrain

Question 4

CN IV

Answer 4

Name: trochlear
Type: motor
Nucleus: trochlear
Function: eye movements (intorsion, abduction)-superior oblique
GSE
Skull exit: superior orbital fissure, midbrain

Question 5

CN V

Answer 5

Name: trigeminal 
Type: V1 V2 sensory 
           V3 mixed 
Nucleus: principle
       Function:  Sensation of light touch of face, anterior 2/3 of tongue 
       GSA 
       Location: pons 
Nucleus: spinal 
        Function: sensation of pain and temp of face anterior 2/3 of the tongue
        GSA
        Location: medulla 
Nucleus: mesencephalic 
         Function: proprioception 
         GSA
         Location: pons/midbrain
Skull exit: V1 superior orbital fissure 
                 V2 foramen rotundum
                 V3 foramen ovals

Question 6

CN VI

Answer 6

Name: abducens 
Type: motor 
Nucleus: abducens 
          Function: abduction ipsilateral lateral rectus muscle
          GSE
Skull exit: superior orbital fissure

Question 7

CN VII

Answer 7

Name: Facial
Type: mixed
Nucleus: facial or motor
Function: muscles of facial expression
Location: pons
SVE
Nucleus: Solitary
Function: Taste to anterior 2/3 of tongue
Location: Pons
SVA
Nucleus: Superior Salivitory
Function: Salivation & lacrimation (Lacrimal gland, submaxillary, submandibular, ALL salvivary gland except parotid)
Location: Pons
GVE
Nucleus: Trigeminal
Function: external ear, external auditory canal (touch, pain, temperature)
GSA
Skull exit: internal acoustic meatus through stylomastiod foramen

Question 8

CN VIII

Answer 8

Name: vestibulocochlear 
Type: sensory 
Nucleus: Vestibular 
               Function: Balance 
               Location: Medulla 
               SSA 
Nucleus: Cochlear 
              Function: Hearing 
              Location: Medulla 
               SSA 
Skull exit: internal acoustic meatus

Question 9

CN IX

Answer 9

Name: glossopharyngeal
Type: mixed
Nucleus: Nucleus Ambiguous
Function: Stylopharynegus Mucle (swallowing and gag reflex)
Location: Medulla
SVE
Nucleus: Inferior Salvatory
Function: Salivation (Parotid gland and pharyngeal gland)
Location: Medulla
GVE
Nucleus: Solitary
Function: Taste posterior 1/3 of tongue, middle ear parotid gland
Location: Medulla
Taste: SVA, Middle ear/parotid GVA
Nuclues: Trigeminal
Function: chemobaroreceptor of carotid body, sensation of light touch from pinna, posterior 1/3 of toungue, middle ear, pharynx
Location: Brainstem
GSA
Skull exit: jugular foramen

Question 10

CN X

Answer 10

Name: vagus
Type: mixed
Nucleus: Nucleus Ambiguous
Function: Swallowing and Gag, Talking (Pharynx, Larynx)
SVE
Nucleus: Dorsal motor vagal
Function: heart, Lungs, digestive tract
Location: Medulla
GVE
Nucleus: Solitary
Function: taste from epiglottis, pharynx, Heart guts, chemobaroreceptors of aortic arch
Location: Medulla
SVA taste, pharynx, Heart guts GVA
Nucleus: Trigeminal
Function: Pharynx, larynx, small area on ear
Location: Brainstem
GSA
Skull exit: Jugular foramen

Question 11

CN XI

Answer 11

Name: spinal accessory 
Type: motor 
Nucleus: Nucleus Ambiguous 
              Function: Swallowing and talking (pharynx and larynx mucles) 
               Location: Medulla 
               SVE 
Nucleus: Spinal accessory 
              function: sternocleidomastoid and upper trap 
               Location: Cervical cord 
               GSE 
Skull exit: Jugular foramen

Question 12

CN XII

Answer 12

Name: Hypoglossal
Type: motor 
Nucleus: Hypoglossal 
             Function: Tongue movements (intrinsic muscles of tongue) 
            Location Medulla 
            GSE 
Skull exit: hypoglossal canal

Question 13

Hints for study

Answer 13

GSE: Nucleus name matches CN name
GVE: parasympathetic, salvatory nucleus 7, 9
GSA: Trigeminal nuclues (5,7,9,10)
GVA: Solitary nuclues 9, 10