Test 4 Cranial Nerves: MB

Created by Meganmichelle2 

Upgrade to
remove ads

52 terms

12

How many pairs of cranial nerves are there?

CN #1

Which cranial nerve is the highest?

PNS

Are cranial nerves part of the CNS or PNS?
(they are similar to spinal nerves)

tumors

Are cranial nerves visible by the naked eye?
Yes, they are big-sometimes can see ________ on them

Cranial nerves

1.Olfactory
2. Optic
3. Oculomotor
4. Trochlear
5. Trigeminal (ophthalmic, maxillary, and mandibular divisions)
6. Abducens
7. Facial
8. Vestibuloacoustic
9. Glossopharyngeal
10.Vagus
11. Spinal accessory
12. Hypoglossal

O O O to touch and feel a girls very soft hands

oculomotor, Trochlear, Abducens

Which cranial nerves control the movement of the eye?
#3-___________
#4-__________
#6-____________

speech, language, and hearing

Which cranial nerves are important for _________ _________ _____ _____________?
#5-Trigeminal
#7-Facial
#8-Vestibuloacoustic
#9-Glossopharyngeal
#10-Vagus
#11-Spinal accessory
#12-Hypoglossal

7

How many cranial nerves are important for speech, language, and hearing?

Olfaction

What is the function and way of testing CN I: olfactory
____________
How to test- use an odorous substance

vision

What is the function and way of testing CN II: optic
Function-_________
How to test-vision chart

eye movements

What is the function and way of testing CN III: oculomotor
Function-most _____ ___________
How to test-"following the moving finger"

superior oblique

What is the function and way of testing CN IV: trochlear
Function-__________ __________
How to test-look down at nose

facial sensation and muscles of mastication

What is the function and way of testing CN V: Trigeminal
Function-___________ __________ _________ ____________ _____ _________________
How to test-touch the face and clench the teeth

lateral rectus

What is the function and way of testing CN VI
Abducens
Function-__________ ______
How to test-look to the side

Facial expression and taste

What is the function and way of testing CN VII
Facial
Function-_________ __________ ______ _______
How to test-smile, raise the eyebrows and sugar or salt

hearing and balance

What is the function and way of testing CN VIII: Vestibuloacoustic
Function-_____________ _____ _________
How to test- a tuning fork and look for vertigo

pharynx sensation

what is the function and way of testing CN IX: Glossopharyngeal
Function-__________ _________
How to test-gag reflex

larynx and pharynx

What is the function and way of testing CN X: Vagus
Function-muscles of the __________ ______ _________ parasymp.
How to test- check for hoarseness, open wide and say "AH"

trapezius and sternocleidomastoid

What is the function and way of testing CN XI
Function-____________ ______ _________________________
How to test-test shoulder raise or turning the head

tongue muscles

What is the function and way of testing CN XII
Hypoglossal
Function-_________ ____________
How to test-stick out the tongue

(CN #1) Olfactory Nerve

*Originates at the level of telencephalon (forebrain)
*Pure sensory nerves which originate from the nasal mucosa part of the nerve and travel to the olfactory bulb at the inferior portion of the frontal lobe
*Damage to this nerve causes anosmia

anosmia

Inability to smell

olfaction and taste

What two senses have chemical sense?

olfaction, species

The sense of _______________ is more powerful in other _________________.

females

Who has a better sense of smell males or females?

(CN #2) optic nerve

*Originates at the level of diencephalon(forebrain)
*95% sensory (afferent) nerves
*5% efferent which change the size of pupils
Course of the nerve-starts from nasal and temporal fibers that originate from the retina and continue their course toward the optic chiasm to the optic tract, then towards LGB of thalamas, finally makes a loop (Myer's loop) amd terminates at Brodmann's area #17 in the Occipital Lobe

(CN#3) Oculomotor

*Originates at mesencephalon (midbrain)
*Pure motor nerve
*Involved in movement of the eye, regulation of pupil size, and convergence of the eyes
*Innervates 5 eye muscles
*damage can result in disconvergence(poor convergence of the eyes-lazy eye)

Convergence of the eye

when the eyes come together

(CN #4) Trochlear

*Originates at mesencephalon (midbrain)
*Pure motor nerve
*Innervates only a single eye muscle-called superior oblique muscle
*damage can cause poor eye movement

Superior Oblique Muscle

Which eye muscle does CN IV Trochlear innervate?

(CN #5) Trigeminal Nerve

*Originates at the level of Pons
*Innervates a muscle of the middle ear-tensor tympani
*Made of three divisions or branches (Ophthalmic V1, Maxillary V2, and Mandibular V3)
*Has mixed nerves (senory and motor)
*Provides motor fibers to muscles of mastication
*Has sensory fibers that provide sensory information for facial, orbital, and oral areas (teeth, oral cavity, and mouth)
*Damages can cause paralysis, difficulty with chewing, and numbness of the face

Opthalmic, Maxillary, Mandibular

What are the 3 branches of CN #5? Trigeminal
_____________ V1, _________ V2, and ___________ V3

temporalis, massetter, and the external pterygoid

What are the muscles of mastication that receive motor fibers from CN #5? Trigeminal nerve

(CN V) Trigeminal

Which CN has the most width and is the biggest?

Neurolgia

pain from the nerve

Trigeminal Neurolgia

Results from damage to CN V-lack of sensory or motor function
*feel pain while brushing teeth or shaving face

(CN #6) Abducens Nerve

*Originates at level of Pons
*Pure motor nerve
*Innervates fibers to only one muscle called lateral rectus muscle
*damage can cause double vision

Convergent Strabismus

double vision
treatable condition with physical eye therapy or surgery

(CN #7) Facial Nerve

*mixed nerve(mainly motor though)
*Innervates muscles of facial expression (smiling, orbic pallaris, and oris)
*Sends branches to (innervates) glands that generate saliva and tears (salvia glands and lacrimal glands)
*sends motor nerves to the stapedius muscle in the middle ear which is important for acoustic reflex
*the sensory branch is called Cortid Tympani-it passes through the middle ear behind the tympanic membrane-innervates anterior 2/3 of the tongue for sense of gustation(taste)
*Damage can cause Bellis, facial paralysis, increased sensitivity to sound called hyperacusis, and lack of sense of taste

hyperacusis

Increased sensitivity to sound

temporal
zygomatic
buccal
maxillary
cervical

What are the 5 branches in the 7th cranial nerve that go from the foramen- stylomastoid to the neck, face, and other areas around the eye?

(CN #8) Vestibuloacoustic Nerve

*Originates at the level of Pons
*Mainly a sensory nerve (more than 90% afferent)-however some are efferent fibers which innervate OHC of the cochlea
*the efferent fibers are called-Olivo Cochlear Bundle
*Has two major branches-vestibular and cochlear
*Damage can cause vertigo, deafness, hearing loss, imbalance, abnormal nystagmus

Vestibular schwannoma
Acoustic neuroma

What are the tumors called that can be caused by damage to CN #8?

Facial nerve decompression

What will remove the tumors caused by damage to CN #8 __________ ________ ______________ which may lead to paralysis

(CN #9) Glossopharyngeal Nerve

*also called Jacobson's Nerve
*Originates at the level of medulla
*Mixed nerve
*Involved in process of swallowing
*Innervates posterior 1/3 of tongue
*Responsible for gag reflex
*damage can cause loss of taste and attribution to swallowing

(CN #10) Vagus Nerve

*Originates at the level of medulla
*Mixed nerve-mainly motor
*sensory branches give sense of taste for the posterior areas of the throat
*Provides sensory information from the thoracic and abdominal areas
*Elevates the palate
*associated with phonation and swallowing
*damages to this nerve can cause dysphonia or swallowing disorders

Dysphonia

lack of voice

Arnold Nerve

makes you cough when you put an eartip in your ear b/c it stimulates CN #8

Vagotonic

very sensitive to vagus nerve-person becomes faint and may die b/c gives a virus to the heart

Vagal Nerve stimulation

Use electrical pulse or stimulation-results in reduction of tinnitus in rats

(CN #11) Accessory Spinal Nerve

*Originates at level of medulla
*Mainly motor nerve
*Innervates sternocleidomastoidian muscle and trapezious muscle
* Has two branches-spinal and cranial
*damage can result in paralysis of sternocleidomastoidian muscle and trapezious muscle-which will influence normal speech

(CN #12) Hypoglossal Nerve

(under the tongue nerve)
*originates at the level of medulla
*Mainly motor nerve
*innnervates extrinsic and intrinsic muscles of the tongue
*controls movement of the tongue
*damage can result in hemiparalysis of the tongue(half of the tongue can't move)

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions above and try again

Example:

Reload the page to try again!

Reload

Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

NEW! Voice Recording

Click the mic to start.

Create Set