A 55-year-old woman comes to the physician because of a 5-month history of weakness of the left side of her face, loss of taste, as well as dryness and redness of her left eye. She has no history of serious illness and takes no medications. Physical examination shows an inability to puff the left cheek and close her left eye. An MRI of the brain shows a contrast-enhancing mass in the posterior fossa. The patient's symptoms are most likely caused by compression of which of the following structures?
- A)Structure A (trochlear nerve, CN IV)
- B)Structure B (trigeminal nerve, CN V)
- C)Structure C (abducens nerve, CN VI)
- D)Structure D (facial nerve, CN VII)GABARITO
- E)Structure E (vestibulocochlear nerve, CN VIII)
Explicação
Structure D is the facial nerve (CN VII), which emerges from the lateral pontomedullary junction at the cerebellopontine angle, medial to CN VIII. CN VII provides motor innervation to the muscles of facial expression (including orbicularis oculi), taste sensat... Ver explicação completa e trilha adaptativa →