The trigeminal nerve is the fifth pair of cranial nerves and the facial nerve is the seventh pair of cranial nerves. The trigeminal nerve is a mixed nerve that includes sensory and motor fibers. If there is a lesion of the trigeminal nerve, the patient mainly presents with sensory disturbance and may experience pain in the distribution area of the trigeminal nerve, mainly in the orbit, periorbital area, facial area, and possibly in the skin of the ear, and some patients may experience toothache. If the motor branch of the trigeminal nerve is damaged, there may also be difficulty in opening the mouth or mastication. If the facial nerve is damaged, the patient may have facial palsy, including loss of frontal lines on the lesioned side, shallow nasolabial folds, skewed corners of the mouth to the lesioned side, incomplete eyelid closure on the lesioned side, white sclera may be exposed when the eyes are closed, and loss of taste sensation in the anterior 2/3 of the tongue.