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
Passavant ridge ?
assistant
The correct answer is  Passavant ridge Near the superior margin of pharynx, a few fibres of superior constrictor blend with a band of muscle fibres belonging to the palatopharyngeus muscle. These fused fibres form a band or ring around the posterior wall and sidewalls of the nasopharyngeal isthumus. When the soft palate is elevated this muscle band appears as a ridge is known as passavant's ridge.