Cranial Nerves

Question 1

CNs outside the brainstem

Answer 1

1 and 2

Question 2

Level of Midbrain

Answer 2

3 and 4

Question 3

Level of pons

Answer 3

5

Question 4

Level of pontomedullary junction

Answer 4

6 (medial) 7 and 8 lateral (internal auditory meatus)

Question 5

Lateral medulla

Answer 5

9, 10, 11

Question 6

Medial medulla

Answer 6

12

Question 7

CN with PNS

Answer 7

1973

Question 8

PNS ganglia and autonomic nerves
Edinger westphal nucles with ciliary ganglion

Answer 8

CN III for ciliary muscle of pupils (constriction)

Question 9

PNS ganglia and autonomic nerves

Lacrimal nucleus with pterygopalatine ganglion

Answer 9

CN 7 for lacrimal gland and glands in palate and nose

Question 10

PNS ganglia and autonomic nerves

Superior salivatory with submandibular ganglion

Answer 10

CN 7 for submandibular and sublingual glands

Question 11

PNS ganglia and autonomic nerves

Inferior salivatory nucleus with otic ganglion

Answer 11

CN 9 for 9arOTIC gland

Question 12

PNS ganglia and autonomic nerves

Dorsal motor nucles no ganglion

Answer 12

CN 10 for heart lungs digestive tract up to splenic flexure

Question 13

Only sensory that does not pass thru the thalamus

Answer 13

Olfaction

Question 14

Pathway of CN II

Answer 14

Rods and cones

Visual pathway (Nerve to chiasm to tract to lateral geniculate (thalamus) to optic radiations (parietal and temporal) to primary visual cortex (BA 17)

Question 15

CN III 2 functions

Answer 15

Motor: oculomotor nucleus to superior orbital fissure to 2 branches

   A) Superior (superior rectus and levator palpebrae superioris)

   B) Inferior (medial rectus, inferior oblique and inferior rectus)

PNS: III NAKA lateral “E” Edinger Westphal —> pupillary cosntrictor

Question 16

CN IV function

Answer 16

Motor: trochlear nuclei (dorsally and cross to lateral) to SO4

Question 17

CN V function

Answer 17

Sensory: SRO foramen to triGasserian ganglion to trigeminal nucleus to VPM
sensation sa face and corneal reflex

Motor: trigeminal motor nucleus V3 foramen ovale —> MASTICATION

Question 18

CN VI function

Answer 18

Motor: Abducens nuclei ascends to DORELLO’S canal —> LR6

Question 20

CN VII functions motor, PNS, special sensation

Answer 20

Motor: facial nucleus to GENICULATE ganglion (curve sya like 7) to styloid foramen thru

Temporal, zygomatic, buccal, mandibular and cervical + OCCs Stap, i can’t DIGEST the STYLHon your face (occipitalis, stapedius, digastric (posterior) and stylohyoid)

PNS: superior salivatory nucleus to lacrimal glands and nasal mucosa (SIPON)

Taste: anterior 2/3 of tongue to submandibular ganglion to TYMPANI to gustatory nucleus solitarius to VPM

Question 21

CN VIII 2 functions

Answer 21

Auditory: cochlea spirally ganglion from tympanic membrane to spiral ganglion to cochlear nerve to cochlear nuclei to olivary nuclei to lateral lemniscus to inferior colliculi to medial geniculate nucleus

COLL 📞 coll
Cochlear nuclei
Olivary nuclei
Lateral lemniscus
Coll (inferior colliculi)

Vestibular: semicircular canals to vestibular ganglion to VPN

Question 23

CN IX 5 functions

Answer 23

Motor: nucleus ambiguous to jugular forame to glossopharyngeal ganglion to STYLOPHARYNGEUS muscle

General somatic (spinal trigeminal nucleus) and taste (gustatory solitary nucleus) : posterior 1/3 of tongue

General visceral sensation: from carotid body to caudal nucleus solitarius “BARORECEPTOR SA CAROTID BODY)

PNS: 9arOTIC gland from otic ganglion

Question 24

CN X 5 functions

Answer 24

Motor: PLE BIGgest exam
Pharyngeal muscle (except stylopharyngeus CN 9), Laryngeal and esophageal in amBIGuous nucleus

General (spinal V nucleus) and special sensory (rostral nucleus): pharynx and epiglottis

Visceral: aortic arch from caudal nucleus solitarius

PNS: Dorsal motor nucleus heart, lungs GI till splenic flexure

Question 25

CN XI

Answer 25

Motor: spinal accessory nucleus and nucleus ambiguous to jugular foramen (cranial and spinal) SCM and traps

Question 26

CN XII

Answer 26

Hypoglossal nucleus intrinsic and extrinsic tongue muscles except palatoglossus (CN X)

Question 27

Cribriform plate fracture

Answer 27

Anosmia (CN I)

Question 29

Trauma to orbit or optic canal

Answer 29

Loss of pupillary reflex and visual field defect (CN II)

Question 30

Impingements from herniating uncus or midbrain tumor or cavernous sinus syndrome

Answer 30

Dilated pupil, ptosis, and loss of ipsilateral pupillary reflex (CN III)

Question 31

Stretching of nerve or fracture of orbit causing strabismus

Answer 31

SO4

Question 32

Injury to terminal branches in maxillary sinus

Question 33

Loss of general sensation of anterior 2/3 of the tongue

Answer 33

CN V

Question 34

Injury to roof of maxillary sinus

Answer 34

CN V2

Question 35

Lesion at base of brain and cavernous sinus causing medial deviation and diplopia on lateral gaze

Answer 35

CN VI

Question 36

Laceration in parotid region causing mouth droops

Answer 36

CN VII

Question 37

Temporal bone fracture causing loss of lacrimation and loss of 2/3 taste

Answer 37

CN VII

Question 38

PROGRESSIVE U/L hearing loss and tinnitus

Answer 38

Acoustic neuroma

Question 39

Brainstem lesion or deep laceration of neck causing loss of sensation to ipsilateral soft palate and posterior 1/3

Answer 39

CN IX

Question 40

Dysphagia, Paralysis of vocal cords, loss of gag reflex with deviation of uvula towards normal side

Answer 40

CN X