10-16 CRANIAL NERVES

Question 1

[ OLFACTORY ] nerve

1. Cranial Nerve # ?
2. Foramen Traveled thru?&raquo_space; What special structure sits on top of this “Foramen”?
3. Component
4. Main Structures/Function for each Component

Answer 1

[OLFACTORY] n.

1. (CN1)
2. [Ethmoid Cribriform Plate] (transmits CN1 tiny branches)» which has [Crista Galli/ Crown of Cock] sitting on top projecting superiorly
3. SVA
4. SVA= Olfactory nasal mucosa / SMELL

Question 2

[ OPTIC ] nerve

1. Cranial Nerve # ?
2. Foramen Traveled?
3. Component
4. Main Structures/Function for each Component
5. Name the Nucleus and their location

Answer 2

[OPTIC] n.
1. CN2

2. Optic Foramen canal
3. SSA
4. SSA= Vision (Rods & Cones)
5. [Lateral Geniculate Nucleus] –>Thalamus

Question 3

[OCULOMOTOR ] nerve

1. Cranial Nerve # ?
2. Foramen Traveled?
3. Component [2]
4. Function for each Component [2]
5. Name the Nucleus and their location [2]

Answer 3

[OCULOMOTOR] n.

1. CN3
2. SUPerior Orbital fissure {CN 3,4,5B1,6}
3. ## [GVE parasympathetic] and GSE
4. A: [GVE psmp]=uses ciliary ganglion to innervate ciliary muscle(fattens lens) & sphincter pupillae

5. A: [Edinger-Westphal] nc–>MIDBRAIN

B: Oculomotor nc —>MIDBRAIN

Question 4

[TROCHLEAR] nerve

1. Cranial Nerve # ?
2. Foramen Traveled?
3. Component
4. Function for each Component
5. Name the Nucleus and its location

Answer 4

[TROCHLEAR] n.

1) CN4
- ——————————————————————————–
2) SUPerior Orbital fissure {CN 3,4,5B1,6}
- ——————————————————————————–
3. GSE

4. GSE= SUPerior Oblique eyeball muscle
5. Trochlear nc—->MIDBRAIN

Question 5

Which Cranial nerves transmit thru the Superior Orbital Fissure of the ____ skull [4]

Answer 5

SUPerior Orbital fissure = FRONT SKULL

CN 3 / 4 / 5B1 / 6

Question 6

[TriGeminal] nerve B1 vs. B2 vs. B3

1. Cranial Nerve # ?
2. Foramen Traveled for each 3?
3. Component [2]
4. Main Structures/Function for each Component [2]
5. Name the Nucleus and their purposes [3]

Answer 6

[TriGeminal] n.
1. CN5
———————————————————————————
2.
B1/Opthalmic = SUP Orbital fissure {CN 3,4,5B1,6]
B2/Maxillary = Foramen Rotundum
B3/mandibular= Foramen Ovale
———————————————————————————
3. GSA and SVE
———————————————————————————
4.
•GSA=
Pain & Temp for Most Head & Face

•••SVE= Motor to ALL mastication muscles, ANT Belly Digastric & [First Arch muscles] reflex

Question 7

Describe what the GSA component of the
[Trigeminal/CN__] innervates?

ºB1/Opthalmic

ºB2/Maxillary [3]

ºB3/mandibular [3]

Answer 7

[Trigeminal/CN5] ALL BRANCHES
GSA= face SENSORY

ºB1(upper face skin)

ºB2(mid face skin, upper teeth,lower nose) /

ºB3 (lower face/jaw/mouth, outer ear pinna,
ANT 2/3 tongue-Touch)

Question 8

• Chorda Tympani n. *
  1) What Parent nerve does this come from and which Component is it?

2) What stuff does this innervate?
3) Where exactly does this nerve branch from its Parent?

Answer 8

“Drink 7 Up…You’ll TASTE it”

1) Facial CN7 [SVA]
2) [Tongue TASTE]
3) Branches from Facial CN7 BEFORE CN7 exits [Stylomastoid] process

Question 9

[ABDUCENS] nerve

1. Cranial Nerve # ?
2. Foramen Traveled?
3. Component
4. Main Structures/Function for each Component
5. Name the Nucleus and its location

Answer 9

[ABDUCENS] n.

1. CN6
2. SUPerior Orbital Fissure {3,4, 5B1, 6}
3. GSE
4. GSE= motor to Lateral Rectus muscle {LR6}
5. Abducens Nucleus —-> Pontomedullary junction in Pons

Question 10

B: LR6 (SO4) 3

Answer 10

B:
ºLateral Rectus = CN6/Abducens

ºSUPerior Oblique = CN4/Trochlear

ºCN3/OCCULOMOTOR = ALL OTHER EYEBALL MUSCLES

Question 11

Name the Nerve you’d use….

A: …To See

B: ….To “Focus” & accommodate after seeing [which associated muscle? ]

C: …Looking at BRIGHT Light [which associated muscle?]

D: …lifting eyelids & opening eyes

E: ….FORCING ur eyes shut!

Answer 11

Nerve you’d use…

A:…to see= CN2/OPTIC

B:…to “Focus” & accommodate after seeing= CN3/Occulomotor [Ciliary muscle]

C: …looking @ BRIGHT light= CN3/Occulomotor [Sphincter Pupillae m.]

D:..lifting eyelids= CN3/Occulomotor [ Levator Palpebrae m.]

E: …FORCING eyes shut!= Facial CN7

Question 12

1) Which nerve system opens the pupil wide?
2) Which nerve system and muscle opens EYELIDS extra wide?

3) Explain eye movement directionality of
[Inferior Oblique m.] & the [Superior Oblique m.]

Answer 12

1) Sympathetic nervous system
2) Sympathetic nervous system

3) I O U O, SO DO
Inferior Oblique Up Out
Superior Oblique Down Out

Question 13

Which 2 Foramen does the Facial CN7 transmit thru?

Answer 13

1st: Internal auditory meatus [located in the temporal bone]
2nd: Stylomastoid Foramen

Question 14

List the 5 Components of [Facial CN7] and EACH of their purposes

1. GVA
2. SVA
3. GVE [4]
4. SVE [4]
5. GSA

B: Name the Nucleus that correspond to each component

Answer 14

[Facial CN7] Components

1. GVA= soft palate deep sensation—>[Lower NST]
2. SVA=Tongue TASTE from anterior 2/3–> [upper NST]
3. GSA= Pain & Temp of [Ear pinna] –>[Spinal Trigeminal Nucleus of V]
4. [GVE]= motor to submand., subling, lacrimal & [nasal mucosa] glands—> [SUP salivary nucleus]
5. SVE= motor to facial express muscle, POST belly digastric, stylohyoid, stapedius –> [motor nuc. of 7]
   - ———————————————————————————

B: [GVE/parasympathetic] & SVE

Question 15

A: Explain the granddaughter branches [5 branches] of the B3 mandibular daughter branch?

B: What is the Parent nerve of this B3 mandibular daughter nerve?

C: Which granddaughter branches goes INTO the mandible and which go UNDER the mandible?

Answer 15

A: B3^mandibular n.———->

1. Meningeal branch
2. Buccal n.
3. Auriculotemporal
4. Inferior Alveolar (—>Mental when emerging)
5. Lingual

B: [Trigeminal/CN5]

C: INTO mandible = Inferior alveolar n..

UNDER mandible to tongue = Lingual n.

Question 16

1) Petrous bone

2) What parent bone is this bone found?
3) What is its clinical significance?

Answer 16

1) MOST DENSE cranial bone that [internal acoustic meatus] is found in

2) Temporal bone
3) Houses [internal acoustic meatus] where Facial CN7 transmits

Question 17

The ____ ____n. gives way to the Pterygopalatine ganglion found from CN__. This in turn gives way to a n. tht travels to innervate the ____ and _____ glands

Answer 17

The GREATER PETROSAL n. gives way to Pterygopalatine ganglion found from CN7, which turns into a n. tht innervates the Lacrimal and Nasal mucosa glands

Question 18

1) List the 4 Cranial Parasympathetic Ganglion

…2)What Cranial nerve runs to it,

[T or F] CN5 is a parasympathetic Fiber itself
———————————————————————————-

What component does all this fall under?

Answer 18

Cows Poop On Shoes = Ciliary / Pterygopalentine / Otic / Submandibular = [GVE]

A: CN3—-(runs with CN5 nasocilliary n.)—> Ciliary ganglion

B:CN7 Grtr Petrosal—(runs w/CN5 zygomatic bnch)
–>Pterygopalentine ganglion–>lacrimal & mucosal glands

C: CN9–(runs w/CN5 Auriculotemporal bnch)—>Otic ganglion–>Parotid glands!

FALSE! CN5 is NOT a parasympathetic fiber
———————————————————————————-

[ GVE/parasympathetic ]!!!

Question 19

What occurs after the Facial CN7 exits the [internal auditory meatus] along with CN__ [3]

Answer 19

Once Facial CN7 exits [internal auditory meatus] (with [CN8/vestibulochoclear/auditory])

1st - visceral motor fibers of Facial CN7 divides into
[Grtr Petrosal n.] & [Chorda Tympani]

2nd- [Grtr Petrosal n.] innervates lacrimal, nasal & Palatine glands

3rd- [Chorda Tympani] innervates submandibular & sublingual Salivary glands

Question 20

1) Describe the Branchial Motor Component of the ___nerve [CN__]
2) What are the muscles of facial expression? [3]
3) Which component does this belong to?

Answer 20

Branchial Motor Component of Facial CN7

ºVoluntary MOTOR control of facial expression muscles, POST belly digastric, stylohyoid & stapedius

2) Buccinator, BOTH Occipitalis, platysma
3) SVE

Question 21

1) Name nerves working in branchial motor component OF Facial CN7? [7]
2) Which component does this belong to?

Answer 21

+ [POST auricular bnch] + [n. to POST Belly Digastric & Stylohyoid]

THe=Temporal bnch
Zombie= Zygomatic bnch
Bit= Buccal bnch
My= Mandibular bnch

Cat= Cervical bnch

2) SVE

Question 22

A: What is Bell’s Palsy caused by?

B: Pt that has Dry Mouth but still can cry has a lesion where at?

Answer 22

A: Facial CN7 irritation

B: Facial Canal (somewhere between [Grtr Petrosal n.] and [Chorda Tympani n.] )

Question 23

[Vestibulocochlear Auditory] nerve

1. Cranial Nerve # ?
2. Foramen Traveled?
3. Component
4. Function for each Component [2]
5. Name the Nucleus and their location [2]

Answer 23

[Vestibulocochlear Auditory] n.

1. CN8
2. internal auditory meatus [along with CN7]
3. SSA [cochlear n. vs. Vestibular n.]
4. A: SSA cochlear = [Organ of Corti] in cochlear duct
   B: SSA vestibular = semicircular canals
5. A: (2 cochlear Nuclei)—> MEDULLA
   B: (4 Vestibular Nuclei)—-> MEDULLA

Question 24

[Glossopharyngeal] nerve

1. Cranial Nerve # ?
2. Foramen Traveled?

3. Components and Nuclei associated
ºGVA [3]
ºSVA
ºGVE
ºSVE
ºGSA

4. Function for each Component

Answer 24

[Glossopharyngeal] n.

1. CN9
2. Jugular Foramen
3. GVA[3] / SVA / GSA / GVE(hitches ride) / SVE
4. ºGVA[3]=[bp via carotid sinus], sensory soft palate, pharynx —>{LOWER NST}

ºSVA= Tongue TASTE—-> {Upper NST}

ºGSA= Pain & Temp of Ear Pinna (via [Spinal Trigeminal nucleus of V] )

ºGVE= “GLOAP”–> parotid salivary gland{secretomotor}—>{inf. salivatory nucleus]

ºSVE = Stylopharyngeaus m. —> [nucleus Ambiguous]

“GLOAP”= Glossopharyngeal n. uses [lesser petrosal n.] to get to otic ganglion—>then uses Auriculotemporal n. to get to PAROTID SALIVARY GLAND destination

Question 25

Which 3 Cranial Nerves transmit thru [Jugular Foramen]?

Answer 25

CN 9, 10 and 11

Question 26

Which 4 Cranial Nerves are Parasympathetic ?

Answer 26

3, 7, 9 and 10 = Parasympathetic CN =

Question 27

[VAGUS] nerve 1. Cranial Nerve # ? 2. Foramen Traveled? 3. Components [5]

Answer 27

[VAGUS] n. 1. CN10 2. Jugular Foramen [along with 9,10,11] 3. GVA / SVA / GSA / GVE / SVE

Question 28

``` A: What are is Function for each Component of the Vagus Nerve [CN__] ºGVA [4] ºSVA ºGVE [2] ºSVE [4] ``` ºGSA B: List the Associated Nucleus with each C: What are the 2 Vagus CN10 [SVE] branches & what do they innervate? Which one wraps around the Aortic Arch?

Answer 28

VAGUS n. = CN10 ºGVA= DEEP sensory to (ALET) abd, larynx, esophagus & trachea---> {Lower NST} ºSVA= Taste buds @ epiglottis [back of throat]--> {upper NST} ºGSA = Pain & Temp of Ear Pinna (via [Spinal Trigeminal nucleus of V] ) ºGVE= [smooth muscle respiratory or GI ] & [controls HR via SA /AV node]--->{Dorsal Motor nc. of 10} ºSVE---> Nucleus Ambiguous 1. All pharynx muscles (except stylopharyngeus) 2. All PALATE muscles (except tensor palatini )[includes Palatoglossus] 3. [Larynx & Cricothyroid] ---------------------------------------------------------------------------------- C: 2 SVE branches: [SUP Laryngeal]-->[External laryngeal branch] -->Cricothyroid [Recurrent Laryngeal]--->Intrinsic Larynx*** = RL wraps around the Aortic Arch!

Question 29

[Spinal Accessory] nerve 1. Cranial Nerve # ? 2. Foramen Traveled? 3. Component 4. Function for each Component 5. Name the Nucleus and its location

Answer 29

[Spinal Accessory] 1. CN11 2. Jugular Foramen AND Foramen Magnum 3. SVE 4. SVE=motor to Sternocleidomastoid & Traps 5. [Spinal Accessory nucleus]---->(C1-C5)Spinal Cord

Question 30

Spinal accessory n. has a ___ root and a _____ root, both that consist of _____ motor fibers

Answer 30

Spinal Accessory n. has a CRANIAL root and a SPINAL root both which consist of BRANCHIAL motor fibers

Question 31

1) Explain which parts of the Spinal Accessory CN11 exit Jugular Foramen vs. Foramen Magnum? 2) What would cause an Ipsilateral deficit of the shoulder?

Answer 31

1) Brainstem exits via Jugular Foramen vs. [C1-5]Roots exit via Foramen Magnum 2) one sided spinal accessory CN11 lesion

Question 32

[Hypoglossal] nerve 1. Cranial Nerve # ? 2. Foramen Traveled? 3. Component 4. Function for each Component [2] 5. Name the Nucleus and its location

Answer 32

[Hypoglossal] n. 1. CN12 2. Hypoglossal Canal 3. GSE 4. GSE= Intrinsic/EXtrinsic tongue muscles mvmnt 5. Hypoglossal Nucleus ---> Rostral MEDULLA

Question 33

All muscles ending with ".....glossus" are innervated by the ________ n. EXCEPT FOR THE ____ n.!

Answer 33

All muscles ending with "....glossus" are innervated by HYPOGLOSSAL CN12 n. EXCEPT FOR [PALATOGLOSSUS n.]

Question 34

Name which nerve is lesioned in these dz A: Tongue weak on one side B: Shoulder Weak on one side C: Bells Palsy/Facial Droop D: Acute Cross-eyed / abducent Direction of gaze in 1 eye E: Down & Out gaze with dilated pupil in 1 eye

Answer 34

A: [Hypoglossal CN12] lesion B: [Spinal Accessory CN11] lesion C: [Facial CN7] palsy D: [Abducens CN6] palsy E: [Occulomotor CN3] palsy

Question 35

Name the 12 Cranial Nerves in Order

Answer 35

``` " Oh, oh, Oh to touch and feel Very good Velvet...Such Heaven" CN1. Olfactory CN2. optic CN3. Occulomotor CN4. Trochlear CN5. Trigeminal ``` CN6. Abducens CN7. Facial CN8. Vestibulocochlear Acoustic CN9. Glossopharyngeal CN10. VAGUS ....... CN11. Spinal Accessory CN12. Hypoglossal

Question 36

Describe These Cranial Nerve Componenents ºGSE ºGSA [3] ºGVE / _______ [3] ºGVA ºSVE [2] ºSVA [2] ºSSA [3]

Answer 36

ºGSE= motor--->voluntary muscle ºGSA= sensation FROM skin/muscle/joints ºGVE/PARASYMPTHC=MOTOR to smooth muscle, [blood vessels] & glands ºGVA= Visceral Sensation & pain FROM internal organs/Guts ºSVE= voluntary motor ---> [pharyngeal arch/Gill muscles] OR Facial Xpression m. ! ºSVA= TASTE & SMELL ºSSA= vision / hearing / Balance

Question 37

Just Name the Functional Components for Each Cranial Nerve 1. Olfactory 2. Optic 3. Occulomotor [2] 4. Trochlear 5. Trigeminal * [2] 6. Abducens 7. Facial * [5] 8. Acoustic/Vestibulocochlear 9. Glossopharyngeal [5] 10. Vagus [5] 11. Spinal Accessory 12. Hypoglossal

Answer 37

1. Olfactory = SVA 2. Optic = SSA 3. Occulomotor = GVE / GSE 4. Trochlear = GSE 5. Trigeminal = SVE / GSA 6. Abducens= GSE 7. Facial = GVA / SVA / GVE / SVE / GSA 8. Acoustic/Vestibulocochlear = SSA 9. Glossopharyngeal = GVA/ SVA / GVE / SVE / GSA 10. Vagus= GVA / SVA / GVE / SVE / GSA 11. Spinal ACCESSORY= SVE 12. Hypoglossal = GSE

Question 38

Which Cranial Nerves are responsible in the following and why: A: CHEWING Food B: SWALLOWING food [2] C: Talking :-)

Answer 38

A: CHEWING Food = [Trigeminal/CN5-B3]--> innervates Lateral & medial Pterygoids ---------------------------------------------------------------------------------- B: SWALLOWING Food= ºCN9-->motor to stylopharyngeus *SVE component* º[CN10 Vagus] ---------------------------------------------------------------------------------- C: Talking :-) = [CN10 Vagus] ----> Larynx

Question 39

" SVE Sara & Just ___ me 2 Geese!...and ____ some Gas GE!"

Answer 39

"SVE SSA & Just [GVE me 2 GSE]!...and dude [SVE some GSA] GE!