Final answer:
The LMN of the face controls the muscles of the face and a lesion can lead to flaccid paralysis. The UMN of the face controls muscle strength and lesions can cause muscle weakness and spasticity.
Step-by-step explanation:
The LMN of the face refers to the Lower Motor Neuron, which controls the muscles of the face. A lesion on the LMN would result in flaccid paralysis, loss of muscle tone, and compromised reflexes in the affected muscles. On the other hand, the UMN of the face refers to the Upper Motor Neuron, and lesions in the UMN can result in muscle weakness, strong deep tendon reflexes, and spasticity.