A 34-year-old man is evaluated in the clinic due to persistent buzzing in his right ear for the past 6 months. The patient also has decreased hearing on the right side. He has had no fever, ear pain, runny nose, sore throat, or cough. The patient does not use cotton swabs and has not been exposed to loud noise. He tried using over-the-counter oral pseudoephedrine with no improvement in his symptoms. On physical examination, there is no sinus tenderness, and mucous membranes are moist without erythema or exudate. Otoscopic examination reveals normal-appearing external auditory canals bilaterally with pinkish-grey tympanic membranes. MRI of the brain reveals an intracranial tumor. This patient's lesion has most likely arisen from which of the following structures? 
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