A 10 year male castrated German Shepherd dog presents for an acute onset of ptosis, drooping of the lip, and drooping of the cheek all on the left side. What nerve has been damaged?
一只10岁雄性已绝育德国牧羊犬由于急性左侧上眼睑下垂,同侧嘴唇以及脸颊下垂前来就诊。那个神经受到了损伤?
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