Hello, the onset of motor neuron disease is slow and the course of disease can be subacute. Symptoms depend on the location of the early injury. Most of the earliest symptoms appeared in the hands. The patient feels that his fingers are weak, stiff and clumsy, and his hand muscles are gradually atrophied, and muscle bundle tremor can be seen. If the early lesion is located in the motor nucleus of the medulla oblongata, there will be dysphonia and swallowing difficulties, paralysis and atrophy of the tongue muscles, and muscle fasciculation on the tongue surface. With more and more methods to treat motor neuron diseases, such as surgery, medicine, physics and so on. They can only protect undamaged nerve tissue and restore some of its functions to a certain extent, but they are ineffective for damaged nerve cells. Common motor neuron injuries will have the following sequelae: 1, facial paralysis: because facial artery, external carotid artery and inferior alveolar artery may be injured during mandibular angle plastic surgery, resulting in massive bleeding. Cause facial paralysis or local facial paralysis. 2. Postoperative scar: Because the mandibular angle plastic surgery has a large amount of bone removal and the incision is exposed, it is easy to cause scar after mandibular angle plastic surgery. 3. Nerve injury: The sequelae of mandibular angle resection may damage the mandibular marginal branch of facial nerve, resulting in paralysis of the upper and middle platysma, descending and decompression muscles, facial deformation (especially when smiling and other facial expressions) and asymmetry.