CN and brain lesions Flashcards
what are the six functional components of the cranial nerves
somatic sensory, visceral sensory, visceral motor (autonomic), somatic motor, special sensory, branchial motor
Sensory nuclei of cranial nerves consist of ___ of ___ order neurons. Exception is ___. Motor nuclei consist of ___ of ___
cell bodies, second order, mesocephalic nucleus. Cell bodies, lower motor neurons
where does the corticobulbar tract run and synapse? exceptions?
medial uncrossed, synapses bilaterally on LMNs in motor nuclei of CNs. Except fibers to LMNs innervating lower face muscles (crossed)
LMN lesions in brainstem or CNs causes___ on the ___ side. UMN lesions in motor cortex or internal capsule cause ___ on ___ side
flaccid paralysis, ipsilateral. Lower facial paralysis, contralateral
bells palsy
LMN lesion of facial nerve causing ipsilateral flaccid paralysis (whole face0
brainstem lesions damage ____ and ____ resulting in ____ syndromes
CN nuclei and motor and sensory tracts. Alternating (crossed) syndromes
medial medullary syndrome: what kind of deficit
alternating hypoglossal hemiplegia: contralat hemiparesis (CS tract), tactile/kinesthetic deficit (med lemn), ipsilat flaccid paralysis of tongue (deviates to paralyzed side)
Lateral medullary (wallenberg’s) syndrome
alternating hemianesthesia: contralat loss of pain and temp from body, ipsilat pain and temp from face. Dysphagia, dysphonia, dyspnea (ipsilateral). Uvula deviates to opposite side on saying “ah”
Ventral (weber’s) syndrome of midbrain
alternating oculomotor hemiplegia: contralat hemiplegia (CS tract) and ipsilat oculomotor palsy
which CN are somatic motor?
3 ,4,6,12
which CN carry parasympathetics
3 (edinger westfall),7,9 (sup and inf salivatory),10 (dorsal motor)
Which CN are branchial motor
5,7, 9/10 (nucleus ambiguus), 11
which CN do taste?
rostral solitary nucleus (7,9,10)
which CN do visceral sensory
caudal solitary nucleus (9,10)
is the corticobulbar tract crossed or uncrossed for SCM and traps?
uncrossed
