Torus tubarius

Anatomical structure in the human nasopharynx

The torus tubarius is an important anatomical structure located in the nasopharynx, which is the upper part of the pharynx that lies behind the nasal cavity. It plays a crucial role in the function of the Eustachian tube, which is responsible for equalizing air pressure in the middle ear.

Anatomy

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Torus tubarius in the nasopharynx

The torus tubarius is a prominent ridge of tissue that surrounds the opening of the Eustachian tube in the nasopharynx. It is formed by the underlying cartilage of the Eustachian tube, known as the tubal cartilage. This structure is located on the lateral wall of the nasopharynx, posterior to the inferior nasal concha.

The torus tubarius is covered by a mucous membrane and is part of the pharyngeal mucosa. It is situated above the soft palate and is adjacent to the pharyngeal tonsil, also known as the adenoids. The prominence of the torus tubarius can vary among individuals and can be more pronounced in certain conditions, such as adenoid hypertrophy.

Function

The primary function of the torus tubarius is to support the opening of the Eustachian tube. The Eustachian tube connects the middle ear to the nasopharynx and is essential for maintaining equal air pressure on both sides of the tympanic membrane (eardrum). This pressure equalization is crucial for proper hearing and to prevent damage to the ear structures.

During activities such as swallowing or yawning, the muscles surrounding the Eustachian tube contract, causing the tube to open. The torus tubarius provides a stable structure for these muscles to act upon, facilitating the opening of the tube and allowing air to pass between the nasopharynx and the middle ear.

Clinical Significance

The torus tubarius can be involved in various clinical conditions. Inflammation or infection of the nasopharynx, such as in cases of upper respiratory tract infections, can lead to swelling of the torus tubarius and obstruction of the Eustachian tube. This can result in Eustachian tube dysfunction, leading to symptoms such as ear fullness, pain, and hearing loss.

In children, enlargement of the adenoids can also affect the function of the torus tubarius by obstructing the Eustachian tube opening. This can contribute to the development of otitis media with effusion, commonly known as "glue ear."

Related Pages

• Eustachian tube
• Nasopharynx
• Pharyngeal tonsil
• Otitis media
• Adenoidectomy