Talk:Corticobulbar tract

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Upper Vs Lower Facial Muscles are Bilaterally Innervated?

Latest comment: 15 years ago2 comments2 people in discussion

Can someone confirm or refute that the upper and not the lower facial muscles are bilaterally innervated by descending corticobulbar tracts. My understanding was that frontalis control was preserved in upper motor neuron lesions suggesting the facial nerve nucleus receives bilateral input from descending pathways. —Preceding unsigned comment added by Tcal (talk • contribs) 07:14, 29 June 2008 (UTC)Reply

Duane E.Haines /Neuroanatomy explains illustraitedly the upper => billateral and the lower mainly crossed and a few uncrossed fibers from the corticobulbar tract.

agreed, how this fact hasn't been changed yet I don't know, but I'm going to change the article to reflect that the upper facial nucleus receives bilateral cortex innervation whereas the lower facial nucleus receives contralateral inntervation. -- Bubbachuck (talk) 23:04, 14 April 2009 (UTC)Reply

Unilateral innervation

Latest comment: 15 years ago2 comments1 person in discussion

From what we have learned in Neuroanatomy, all the CN's except VII and XII are bilateral. I didn't want to change it without first double checking Haines Neuroanatomy Rrten00 (talk) 14:16, 24 October 2009 (UTC)Reply

Edit- Confirmed in Essential Neuroscience by Siegel that VII and XII are contralateral, VII below the eye and XII Rrten00 (talk) 14:45, 24 October 2009 (UTC)Reply

TWO NEURON motor pathway?

Latest comment: 8 years ago1 comment1 person in discussion

What does it mean that the corticobulbar tract is a two neuron white matter motor pathway? Mustn't there be more than two neurons (axons) in such a tract? — Preceding unsigned comment added by UnderEducatedGeezer (talk • contribs) 18:47, 13 June 2016 (UTC)Reply

It means that there is one neuron from the cortex to the nucleus in the brainstem, then another neuron from the nucleus to the muscle. There will often be many neurons running parallel in each nerve, but it is a two neuron long chain.

multi-functional?

"The corticobulbar tract is composed of the upper motor neurons ... Fibers that end in the sensory nuclei of the brainstem are thought to enhance or inhibit sensory transmission across various sensory nuclei." Does this mean, neurons with fibers ending in sensory nuclei (which?) would be called upper motor neurons?

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