Praxis SLP Licensure Exam

Which cranial nerve is most likely damaged in a patient with right facial droop due to weakness on the right side of the face?

1. Trochlear

2. Trigeminal

3. Facial

4. Vagus

The correct answer is: Facial

The appropriate response focuses on the role of the facial nerve, which is responsible for the motor control of the muscles of facial expression. If there is weakness or drooping on one side of the face, it is indicative of an issue with this nerve, specifically in the regions it innervates. In this scenario, the right facial droop suggests that the cranial nerve that expresses motor function to the right side of the face is compromised, which directly correlates with the function of the facial nerve. The facial nerve's involvement in the movement of facial muscles makes it critical in assessing facial appearance and movement. Damage or impairment to this nerve can lead to observable symptoms such as drooping, weakness, and difficulty in expressing emotions through facial movements on the affected side, confirming its pivotal role in facial musculature. Other cranial nerves listed do not primarily affect facial movement in the same manner. The trochlear nerve is involved in eye movement, the trigeminal nerve mainly deals with sensation in the face and motor functions for mastication, and the vagus nerve primarily influences visceral functions. Thus, the involvement of the cranial nerve responsible for facial motor function, which is clearly identified as the facial nerve, provides a clear explanation for the observed right facial