Flashcards in Cranial nerves Deck (18):
What nerve innervates the muscles of mastication?
Trigeminal nerve (V3)
What are the muscles of mastication?
3 close the jaw:
1 opens the jaw: lateral pterygoid
Result of facial nerve (CN VII) lesion
--ipsilateral facial paralysis (paralysis of muscles of facial expression)
--inability to close eye (orbicularis oculi)
--loss of corneal reflex (efferent limb)
if the lesion is to the proximal facial nerve:
--loss of taste sensation to anterior 2/3 of the tongue
--hyperacusis (increased sensitivity to sound because of paralysis of stapedius muscle)
--disturbed lacrimation and salivation
What is facial nerve palsy?
complete destruction of the facial nerve nucleus itself, or its effert fibers (the facial nerve)
With regard to facial lesions, where would an upper motor neuron lesion be, and what would be the result?
Lesion of the motor cortex or connection between the cortex and the facial nucleus.
Results in contralateral paralysis of lower face.
**The forehead is spared due to bilateral UMN innervation
What would be the result of a lower motor neuron (LMN) lesion to the facial pathway
ipsilateral paralysis of the upper and lower face.
What diseases is facial nerve palsy associated with?
--herpes zoster (less common)
Treatment of facial nerve palsy
An inability to chew would result from a lesion to what nerve?
a lesion of this nerve would cause the jaw to deviate to the side of the lesion (side of muscle weakness) due to unopposed force from opposite pterygoid muscle
Physical exam manifestation of a CN X lesion
uvula deviates away from the side of the lesion
Physical exam manifestation of CN XII lesion
Tongue deviates toward the side of the lesion due to weakened tongue muscles on affected side.
(genioglossus, hypoglossus, styloglossus)
Physical exam manifestation of CN XI lesion
Weakness turning head to contralateral side of lesion (Right sternocleidomastoid contracts to turn head to the left)
Shoulder droop/weakness in attempt to shrug shoulder on the side of the lesion (trapezius)
Impairment of facial sensation would result from a lesion to what nerve?
The three cranial nerves that supply taste
7, 9, 10
What nerve is required to say "mi"?
CN 7 is needed to move the lips while saying "mi"
What nerve is needed to say "kuh"?
CN X is needed to raise the palate while saying "kuh"
What nerve carries general somatic sensation from the posterior part of the upper pharynx?