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
Tympanic plexus present in -
assistant
The correct answer is  B i.e. Medial projection of middle ear cavity Tympanic nerve arises from the glossopharyngeal nerve, just below the jugular foramen. It passes through the floor of middle ear and reaches onto the mucous membrane covering the promontory(2, where it splits into branches and joint branches of internal carotid plexus to form tympanic plexus. Promontary is round bulging in the medial or labyrinthine wall of middle ear cavityQ produced by the first turn of cholea.