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mastoid bone
The lower part of the temporal bone of the skull. Jutting from the lower part of the mastoid bone is a bony projection called the mastoid process.
The mastoid bone is honeycombed with air cells, which are connected to a great cavity called the mastoid antrum in the upper part of the mastoid. The mastoid antrum leads into the middle ear. As a result, infections of the middle ear occasionally spread throughthe mastoid bone to cause acute mastoiditis.
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• ANATOMY AND PHYSIOLOGY
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