A patient with weakness of the left lower face but preserved forehead function suggests a lesion in which location?

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Prepare for the Praxis Dysphagia Test with flashcards and multiple-choice questions, designed to provide explanations and hints. Equip yourself with the knowledge needed for your examination!

Multiple Choice

A patient with weakness of the left lower face but preserved forehead function suggests a lesion in which location?

Explanation:
Forehead sparing with a weakness limited to the lower face points to an upper motor neuron (central) pattern of facial weakness. The upper face receives bilateral cortical input, while the lower face is mainly controlled by the contralateral cortex. So weakness of the left lower face with a preserved forehead means the lesion is in the right cortex (or right corticobulbar pathway) affecting the contralateral lower face. A left cortical lesion would produce right lower face weakness, and a peripheral (LMN) facial palsy would affect both upper and lower facial muscles on the same side, including the forehead.

Forehead sparing with a weakness limited to the lower face points to an upper motor neuron (central) pattern of facial weakness. The upper face receives bilateral cortical input, while the lower face is mainly controlled by the contralateral cortex. So weakness of the left lower face with a preserved forehead means the lesion is in the right cortex (or right corticobulbar pathway) affecting the contralateral lower face. A left cortical lesion would produce right lower face weakness, and a peripheral (LMN) facial palsy would affect both upper and lower facial muscles on the same side, including the forehead.

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