Anatomical Openings into the Nasopharynx

The nasopharynx communicates with adjacent structures via several openings:

1. Eustachian (Pharyngotympanic) Tubes

Paired tubes connecting the middle ear to the lateral nasopharynx. Function: pressure equalization, drainage. Openings lie on the lateral walls, posterior to the torus tubarius.

2. Choanae (Posterior Nasal Apertures)

Paired openings between the nasal cavities and nasopharynx. Allow airflow from nose to nasopharynx. Bounded by sphenoid bone (roof), vomer (medial), palatine bones (floor), and medial pterygoid plates (lateral).

3. Pharyngeal Tonsil (Adenoid)

Lymphoid tissue on the posterior-superior nasopharyngeal wall. Not a "tube" but a prominent structure. Hypertrophy can obstruct choanae or Eustachian tubes.

4. Pharyngeal Recesses (Fossa of Rosenmüller)

Paired lateral recesses behind the Eustachian tube openings. Common site for nasopharyngeal carcinoma origin.

Clinical Relevance

• Eustachian tube dysfunction → otitis media, barotrauma
• Choanal atresia → neonatal airway obstruction
• Adenoid hypertrophy → nasal obstruction, sleep apnea, otitis media
• Rosenmüller fossa → "hidden" tumors