In acute facial weakness, which muscle may be weak for a few days, making it indistinguishable from a lower motor neuron (LMN) weakness?

In acute facial weakness, which muscle may be weak for a few days, making it indistinguishable from a lower motor neuron (LMN) weakness?

In acute upper motor neuron (UMN) facial weakness, the frontalis muscle (which controls forehead movement) can be temporarily weak. This initial weakness may resemble a lower motor neuron (LMN) weakness. However, it’s important to differentiate between these two types of lesions. In UMN lesions, frontalis is eventually spared, while in LMN lesions, both upper and lower facial muscles are affected.

Одобрено от Dr. Petya Stefanova

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