system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Facial recess or the posterior sinus is bounded by:
assistant
The correct answer is  Facial recess or Posterior sinus - It is a depression in the posterior wall of the middle ear. It is bounded by: Medially - Veical pa of VIII nerve Laterally - Chorda tympani Above - Fossa incudis