Facial Nerve Lesions

[greentealeaves]

Is this your guys's understanding of facial nerve lesions:

Upper motor neuron: lesions will cause contralateral weakness of the lower 2/3 of the face

Facial Nerve nucleus: lesion will cause ipsilateral weakness of the lower 2/3 of the face.

Lower motor neuron: lesion will cause ipsilateral weakness of that entire side of the face.

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[FalconSlice]

Is this your guys's understanding of facial nerve lesions:

Upper motor neuron: lesions will cause contralateral weakness of the lower 2/3 of the face

Facial Nerve nucleus: lesion will cause ipsilateral weakness of the entire side of the face

Lower motor neuron: lesion will cause ipsilateral weakness of that entire side of the face.

There is always confusion surrounding this, and I blame the professors/teachers for not making this accessible to medical students. I think this is party conflated by the fact that the hardcore neuroscience is actually very convoluted and not completely understood. That being said, I'll just correct what you wrote without further explanation unless you require it (see bolded). For all intents and purposes, the nucleus is a LMN lesion (i.e., the nucleus is made up of the LMN cell bodies!). An impressive pimp question if you'll get right, neuro people will bow down at your feet: What artery if injured can give isolated CN VII nucleus lesion?

Source: PhD in neuroscience

 

[HopeIsStrength]

There is always confusion surrounding this, and I blame the professors/teachers for not making this accessible to medical students. I think this is party conflated by the fact that the hardcore neuroscience is actually very convoluted and not completely understood. That being said, I'll just correct what you wrote without further explanation unless you require it (see bolded). For all intents and purposes, the nucleus is a LMN lesion (i.e., the nucleus is made up of the LMN cell bodies!). An impressive pimp question if you'll get right, neuro people will bow down at your feet: What artery if injured can give isolated CN VII nucleus lesion?

Source: PhD in neuroscience

Would it be a branch of AICA that I just don't even know?

 

[FalconSlice]

Would it be a branch of AICA that I just don't even know?

Correct! If you're going into neuro and want to impress further, you can also mention in PICA dominant individuals (not uncommon of a variant), it can also be from PICA. Unknowable w/o doing an angiogram. Anyway, enough nerding out for now.

 

[HopeIsStrength]

Correct! If you're going into neuro and want to impress further, you can also mention in PICA dominant individuals (not uncommon of a variant), it can also be from PICA. Unknowable w/o doing an angiogram. Anyway, enough nerding out for now.

I won't lie to you I didn't know there was such a thing as PICA dominant individuals. Thank you so much!!!

 

[whataschool_classof24]

There is always confusion surrounding this, and I blame the professors/teachers for not making this accessible to eggs. I think this is party conflated by the fact that the hardcore neuroscience is actually very convoluted and not completely understood. That being said, I'll just correct what you wrote without further explanation unless you require it (see bolded). For all intents and purposes, the nucleus is a LMN lesion (i.e., the nucleus is made up of the LMN cell bodies!). An impressive pimp question if you'll get right, neuro people will bow down at your feet: What artery if injured can give isolated CN VII nucleus lesion?

Source: PhD in neuroscience

In regards to OP, wouldn't an upper motor lesion lead to contra weakness below the brow and not the entire anterior 2/3 of the head?

 

[FalconSlice]

In regards to OP, wouldn't an upper motor lesion lead to contra weakness below the brow and not the entire anterior 2/3 of the head?

OP said UMN lesion leads to weakness of contra lower 2/3 of face which is correct (and also what you said)