Cranial Nerves High Yield Flashcards
Which CN nuclei lie medially?
III, IV, VI, XII
Factors of 12, except 1 and 2
Function of the superior coliculi?
Conjugate vertical gaze
Function of inferior colliculi?
auditory
Which CN nuclei are located in the midbrain?
III, IV
Which CN nuclei are located in pons?
V, VI, VII, VIII
Which CN nuclei are located in the medulla?
CN IX, X, XII
Which CN nuclei is located in the spinal cord?
XI
Where does CN I exit through?
cribiform plate
Where does CN II exit through?
optic canal
Were dies CN V2 exit through?
Foramen Rotundum
Where does CN V3 exit through?
Foramen Ovale
Where does the middle meningial artery exit through?
Foramen spinosum
What exits through the superior orbital fissure?
CN III, IV, V1 VI, ophthalmic vein, sympathetic fibers
What exits through internal auditory meatus?
CN VII, VIII
What exists through jugular foramen?
CN IX, X, XI, jugular vein
What exists through hypoglossal canal?
CN XII
Where does CN XI exit through?
Foramen magnum
Which eye muscles does CN III control?
SR, IR, MR, IO
Accomidation
Levator palpebrae (eyelid opening)
Which muscle does the trochlear nerve control?
SO
Which nerve innervates the muscles of mastication?
Trigem
What are the 3 divisions of trigem?
Ophthalmic
Maxillary
Mandibular
What muscle does the abducens nerve control?
LR
Which nerve controls facial movement?
CN VII
Which nerve innervates the stapedius muscle in the ear?
CN VII
Which nerve controls the orbicularis oculi (eyelid closing)?
CN VII
Nerve that innervates swallowing and soft palate elevation and the uvula?
CN X
Which nerve innervates the SCM and trapezius?
CN XI
Which nerve innervates tongue movement?
CN XII
What is the swallowing center?
Nucleus ambguus
Nerves involved in nucleus ambiguus?
IX, V, XI
WHat is the visceral sensory center for taste, baroreceptors and gut distention?
Nucleus solitarius
What nerves are involved in the nucleus solitarius?
VII, IX, X
Afferent and efferent branches of the corneal reflex?
Afferent= V1 (nasocilliary branch)
Efferent= VII (Temporal branch)
Afferent and Efferent branches of the lacrimal reflex?
Afferent= V1
Efferent= VII
Afferent and efferent branches of the jaw jerk?
Afferent= V3 (sensory)
Efferent= V3 (motor- masseter)
Afferent and efferent branches of the pupillary reflex?
Afferent= II
Efferent= III
Afferent and efferent branches of the gag reflex?
Afferent= IX
Efferent= X
Uvula deviates toward or away from the side of the CN X lesion?
Away
When an CN XI lesion occurs, is there weakness when turning the head towards or away from the side of the lesion?
turning away (contralateral)
When an CN XI lesion occurs, is there shoulder droop of contralateral or ipsilateral side of the lesion?
Ipsilateral side
Does tongue deviate towards or away from the side of lesion?
Toward
Where is the cavernous sinus located?
On either side of the pituitary
Where CN nerves pass through the cavernous sinus?
III, IV, V1, VI
How does the outer ear transfer sound?
Vibration of eardrum
How does middle ear conduct and amplify sound?
ossicles (malleus, incus and stapes)
How does the inner ear transmit sound?
Basilar membrane vibrates secondary to sound waves–> transduction via har cells–> auditory nerve signaling–> brain stem
Where are low frequency sounds heard?
Apex
Where are high frequency sounds heard?
Base
Where are high frequency sounds heard?
Base
What type of hearing loss has an abnormal Rinne test (Bone> air)?
Conduction
Which type of hearing loss has a weber test that localizes o the unaffected ear?
Sensory neuronal
What type of lesion:
“contralateral paralysis of the lower face and the forehead is spared”
UMN lesino
What type of lesion:
“ipsilateral paralysis of upper and lower face”
LMN lesion
What type of lesion:
“peripheral ipsilateral facial nerve paralysis with inability to close eye on involved side”
Facial nerve Palsy (Bell’s Palsy)
