corticobulbar tract Flashcards

1
Q

corticonuclear or corticobulbar tract

A

function: controls muscles of the head and face

corticonuclear fibers originate in precentral gyrus, fibers pass with corticospinal tract fibers through corona radiata, internal capsule area area 4 gennu and cerebral peduncle

corticonuclear fibers project bilaterally and terminate in brainstem motor nuclei of CNs V and VII, XII contralaterally, and nucleus ambiguus (CN IX and X) and accessory nucleus

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2
Q

cortical or internal capsule lesions

A

simultaneously affect the corticospinal tract and corticonuclear tract, pts will show contralteral hemiplegia accompanied by CN signs

CNVII– see pg 5 and 6 of handout
CN XII-

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3
Q

pseudobubar palsy

A

bilateral lesion of corticobulbar tract

Dysphagia , dysarthria, paresis of tongue, loss of emotional control

Causes: brainstem infarct, ALS, MS

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