A five-year-old female spayed Cocker Spaniel is presented with a drooping right ear and lip. There is ptosis O.D. (right eye) and the dog is drooling on the exam table. She is otherwise bright, alert, and responsive. What anatomic structure is damaged? 一只5岁雌性已绝育可卡犬由于右侧耳朵和嘴唇下坠前来就诊。其右眼眼睑下垂，而且流了很多口水在诊台上。她活泼，警觉并且反应正常。她的哪个解剖结构受到了损伤？