Flashcards in Cranial nerves IV Deck (16)
what is the sensory ganglion of the facial nerve?
what are the two parasympathetic ganglia associated with the facial nerve?
1. pterygopalatine 2. submandibular
what are the two nuclei associated with the facial nerve?
1. facial nucleus (motor) 2. superior salivatory nucleus (parasympathetic)
taste is projected to what nucleus? via which tract?
to the solitary nucleus via the solitary tract
orofacial pain from the facial nerve territory is projected to what nucleus? via what tract?
to spinal V nucleus via the spinal V tract
what are the three branches of the facial nerve within the termporal bone? what are their functions?
1. greater petrosal - lacrimation, nasal and salivary secretions 2. chorda tympani - taste 3. nerve to stapedius - hearing
the cell bodies of the nervus intermedius reside in which nucleus?
how is the hypothalamus involved in taste sensation?
solitary nucleus projects to hypothalamus which mediates visceral responses to unpleasant sensation (gag reflex, vomit reflex)
where are nociceptive fibers from the facial nerve (and CN 9 and 10) sent?
spinal tract of trigeminal nerve
what is the pattern of termination of the corticonuclear fibers on the facial nucleus?
1. upper half - bilateral corticonuclear projections 2. lower half - contralateral corticonuclear projections
Bell's palsy is due to what type of lesion? on which side?
LMN paralysis lesion affecting entire half of face on ipsilateral side
what are the symptoms of Bell's palsy?
dry eye, hyperacusis, diminished taste sensation, weakness / paralysis on one side of face
what are the symptoms of crocodile tear syndrome? what is the cause?
1. patients produce tears instead of saliva when they see / taste food 2. facial nerve lesion in facial canal proximal to geniculate ganglion - axon sprouts that should grow toward submandibular but instead grow to pterygopalatine ganglion
what is the pathway of the pyramidal system of conscious, voluntary control of facial muscle movement?
UMNs of corticonuclear tract - facial nucleus in brainstem - LMNs via facial nerve - muscles of facial expression
what is the alternate pathway to facial nucleus involved in involuntary, genuine facial expression?
accessory motor areas in frontal lobe and basal ganglia - reticular formation - bilateral projections to facial nucleus - LMNs to muscles of facial expression