CNs V and VII Flashcards
injury to CN V motor nucleus
- jaw closure is weakened
- opened jaw will deviate toward side of lesion
supratrigeminal nuc is actually part of _____; is a pattern generator for _____
RF; masticatory rhythm
V motor nucleus is branchial motor to muscles derived from ____
1st pharyngeal arch
V motor nuc is efferent limb of _____
jaw-jerk reflex
trigeminal main sensory nucleus is in the ____
mid-pons
spinal trigeminal nucleus in the _____
caudal medulla
V fibers representing the center of the face end near the ____
obex (more rostral)
V fibers representing the periphery of the face end in the _____
upper cervical cord (more caudal)
the more caudal the spinal trigeminal tract injury, the ____ the area around the mouth that is spared of sensory loss
larger
CN VII and CN VII motor nucleus can be seen in the ____
caudal pons
corticobulbar pathway lesion results in:
upper facial muscles are intact (because there is bilateral innervation)
lower facial muscles of one side will be paralyzed (because there is contralateral innervation)
branches of _____ most frequently involved in cases of trigeminal neuralgia due to vascular cause
superior cerebellar a.
type of unilateral facial paralysis due to VII dysfunction
bell’s palsy
actions of CN VII
- mm of facial expression: closes mouth, closes eye
- stapedius mm- modulates sound voume
- sensory to skin of outer ear, palatine tonsil, posterior nasal cavity
- taste to anterior 2/3 of tongue
- salivation
- lacrimation
symptoms of Bell’s palsy
- irritation of cornea
- paresis of mm above and below eye
- cannot close eye on affected side
- sensitivity to sound (hyperacusis)
- reduced lacrimation and salivation
