Objective To observe the protective effects of topical application of glial-cell-derived neurotrophic factor (GDNF) on facial motoneurons following facial nerve injury in adult rats.

• 目的观察大鼠面神经低位切断伤后，大鼠面运动神经元死亡的时间进程和胶质细胞源性神经营养因子(GDNF)局部应用对伤后面运动神经元的作用。