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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
Which of the following cavities are separated from the middle cranial fossa by a thin layer of bone?
assistant
The correct answer is  The middle ear cavity is separated from the middle cranial fossa by the tegmen tympani, a thin plate of the petrous pa of the temporal bone. A pa of the roof of the sphenoid bone forms the floor of the hypophyseal fossa. The other pairs of sinuses or bony cavities are not separated from the middle cranial cavity.