Your 60-year-old patient, Mr. Guster, has Bell’s palsy, which uses dysfunction of those portions of the facial nerve thatcontrol muscles of facial expression. He is surprised when you tell him to tape...

Your 60-year-old patient, Mr. Guster, has Bell’s palsy, which uses dysfunction of those portions of the facial nerve thatcontrol muscles of facial expression. He is surprised when you tell him to tape the eyelids of his right eye closed at night to prevent

dryness. Why might Bell’s palsy cause dryness of the eye on the affected side?