The facial nerve is tortuous and complex in composition[1]。 Facial nerve function injury is mainly manifested in clinic as facial expression muscle paralysis (referred to as facial paralysis) dominated by it: shallowing or disappearing of frontal lines, difficulty in raising eyebrows, exposure of white eyes after closing eyes, enlarged eye fissures, shallow nasolabial folds, bulging cheeks and leaking air, tilting of mouth corners to the healthy side, tearing and salivation, etc. Symptoms of hypotaste or hyperacusis may also occur. In addition, some patients may also have complications such as facial joint movement, facial muscle atrophy and crocodile tear syndrome during the recovery period, which seriously affects the quality of life of patients. Facial nerve function injury can be divided into idiopathic, infectious, immune, neoplastic and traumatic according to the etiology; Among them, idiopathic facial nerve palsy is the most common, and the incidence rate abroad is (11.5~53.3) /100,000[2]The incidence rate in China is 49.77/100,000[3]However, the treatment rate of facial paralysis and facial paralysis sequelae in the population is very low, and only 15.1% of patients can recover through accurate and timely diagnosis and treatment[4]。
