Answer :

Final answer:

People with volitional facial paresis cannot control their facial expression muscles voluntarily, often due to facial nerve damage. Tests against resistance help determine muscle integrity and repeated trials can confirm the consistency of the muscle weakness.

Explanation:

People with volitional facial paresis are unable to voluntarily control the muscles of facial expression. This condition can be observed during a neurological examination, and it often indicates damage to the facial nerve or areas of the brain that control these muscles. The facial nerve is responsible for the movements required for facial expressions, as well as functions like mastication, swallowing, and speech. During an examination, directed tests, particularly against resistance, assess the integrity of the facial muscles. In the strength test from the provided video, the reason the examiner asks the patient to squeeze her eyes shut a second time is to confirm the strength and voluntary control of the facial muscles on repeated attempts, which provides vital information regarding the severity and consistency of the facial paresis.

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