corticobulbar

[HiddenTruth]

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I had a question come up re: to this. Is there anything else a unilat CB tract lesion will produces except contralteral lower facial weakness and contralteral tongue weakness, i.e. is there any other tissue that gets only unilat input from CB?

Also, what's the deal with CN XI--so it goes up to join nucleus ambigus and then exits with vagus? Wow, I was definately not taught that. So, how is this relevant? Lesions of vagus never mention anything about traps or SCM mm weakness. Aite, thanks--

 

[Ramoray]

hey hidden, ya i hate remembering which nerves exit where and with what. I think you covered it with the cortico bulbar distribution. remember also taht the trochlear, abducens and oculomotor do not have any corticobulbar fibres, not that it is usefull but maybe a random trivia board question.. i guess it makes sense but who knows.
As for the cn XI, i think the only tiem you see it involved with the vagus are things like tumors or aneuysms involving the jugular foreman whcih IX, X and XI exit out of. I dont konw if there is something officially called jug. foreman sydnrome but anything involving this area will gvie you signs from each of those. So if a patient had shoulder weakness, along with cnX and IX sysmptoms then you could think of something going on in the jug.. other than that i dont know any lesions that involve together. looks like you didnt quiit neuro studying as planned a few days ago huh!

 

[viper]

I think with the CN XI, the thing is that it arises from the cervical cord and goes up etc. Therefore brainstem lesions will not involve CN XI, so if it is involved it is not in the brainstem - maybe the jugular foramen like ramoray mentioned.