Review Cranial Nerves Flashcards
(25 cards)
What are the motor inputs from CNIII?
- Levator palpebrae superioris
- Superior/inferior/medial recti
- Inferior oblique
What is the parasympathetic GVE of CNIII?
-Sphincter papillae and ciliary muscles
What are the cutaneous branches of the trigeminal nerve?
SIMBA Supraorbital Infraorbital Mental Buccal Auricotemporal
What is the sensory afferents from the orbit to cornea and sclera?
V1
What is involved in the corneal blink reflex?
Sensory: V1
Motor: CNIII
What nerve causes loss of sensation in the palate?
Palatine branches of V2
What nerve causes pain in the upper teeth?
Superior Alveolar branch of V2
what sensory deficit would be present if damage to V3 at foramen ovale?
Loss of sensation over mandible, anterior to external ear, over posterior temporal area
- Loss of sensation to lower teeth
- Loss of general sensation to anterior 2/3 tongue
If damage to V3, is taste to anterior 2/3 of tongue affected?
No; chords tympani joins lingual nerve inferior to foramen ovale
What motor defects if V3 injured?
Muscles of mastication
How do you test function of muscles of mastication?
Close jaw, palpate superficial jaw closers (tempralis and master)
Open jaw against resistance, see if chin deviates to side of lesion (crushed can)
What motor defects if V3 at foramen ovale?
Hyperacusis caused by loss of tensor tympani
Nasal speech, regurgitation into nasopharynx while swallowing bc loss of tensor veli palatine muscle in soft palate
Uvula/soft palate deviates to right at rest, left during contraction. Where is the lesion? (2)
AWAY from lesion at rest, towards lesion during contraction.
LEFT vagus (CNX) or LEFT V3
If there is a lesion to the stylomastoid foramen, what would result?
Facial palsy
*This is from CNVII to muscles of facial expression
What deficits if lesion to the if lesion to facial canal below stapedius?
Facial palsy, taste anterior 2/3 tongue, salivary gland floor of mouth, skin
*eyes will still water, hearing balance not affected
What deficit if lesion to facial canal right before greater petrosal nerve bifurcation?
Facial palsy, taste anterior 2/3 tongue, salivary gland to floor of mouth, skin, hyperacusis, dry eye, nasal cavity/palate
*hearing balance not affected
What deficit if lesion immediately to facial canal?
Facial palsy, taste anterior 2/3 tongue, salivary gland to floor of mouth, skin, hyperacusis, dry eyes, nasal cavity palate, LOSS OF HEARING BALANCE
What nerve innervates the parotid gland?
CNIX glossopharyngeal nerve
What innervates all the motor muscles of the larynx, palate, upper esophagus EXCEPT tensor veli palatine and stylopharyngeus muscle? What innervates the later?
CNX
TVP-> V3 (VP -> V3)
Stylo->IX
What nerve has a lesion if nasal speech and liquids in nasal cavity when swallowing. When at rest, soft palate and uvula seem to deviate to right. When contraction, deviates to the right. What side?
Lesion in LEFT vagus nerve or LEFT mandibular division of trigeminal
What are the afferent and efferent limbs of the gag reflex?
Afferent limb -> CNIX
Efferent ->CNX
If wooden tongue blade is touched to mucosa on one side of the pharynx of patient, what response?
Symmetrical gag response/constrictio
If wooden tongue blade touched to EITHER side of the pharynx with damaged right vagus, what response?
Left side constricts, asymmetrical gag response with deviation to left
What are the afferent and the efferent limbs of the cough reflex?
Afferent: CNX (superior/inferior laryngeal nerve)
Efferent: CNX, phrenic, abdominopelvic
