corticobulbar tract Flashcards
corticonuclear or corticobulbar tract
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
cortical or internal capsule lesions
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-
pseudobubar palsy
bilateral lesion of corticobulbar tract
Dysphagia , dysarthria, paresis of tongue, loss of emotional control
Causes: brainstem infarct, ALS, MS