Cranial nerves IV Flashcards Preview

Year 1 Neuroanatomy > Cranial nerves IV > Flashcards

Flashcards in Cranial nerves IV Deck (16):

what is the sensory ganglion of the facial nerve?

geniculate ganglion


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?

geniculate ganglion


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


what are the components of the corneal blink reflex pathway?

1. stimulation of peripheral processes of pseudounipolar neurons in cornea relay to trigeminal ganglion 2. central processes of trigeminal ganglion travel to both the spinal trigeminal nucleus and main sensory nucleus of trigeminal 3. second order neurons synapse at facial motor nucleus which projects to orbicularis oculi muscle via the facial nerve - blinking occurs