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Pharynx and Waldeyer's ring

  • Applied anatomy

The throat has three parts behind the nose, mouth and larynx, guarded by a ring of tonsils that is largest in childhood.

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See it in 3D: Pharynx · Palatine tonsils · Soft palate

What it is

The pharynx is a muscular tube from the skull base to the oesophagus, divided into the nasopharynx (air only), the oropharynx (air and food) and the laryngopharynx (opening to the larynx in front and the oesophagus behind). A ring of lymphoid tissue, Waldeyer's ring, guards its entry: the adenoid on the roof of the nasopharynx, the tubal tonsils at the Eustachian tube openings, the palatine tonsils in the oropharynx and the lingual tonsil at the tongue base. This layout explains why big adenoids cause mouth breathing and ear effusions, why tonsil infections spread to the neck, and where cancers hide.

Applied anatomy

  • Nasopharynx: behind the nose, above the soft palate; contains the adenoid and the openings of the Eustachian tubes.
  • Oropharynx: from the soft palate to the epiglottis tip; contains the palatine tonsils, the tongue base and the lingual tonsil.
  • Laryngopharynx (hypopharynx): behind the larynx, continuous with the oesophagus.
  • Soft palate and uvula: rise to seal the nasopharynx during swallowing.
  • Sensory supply of the tonsil region includes the glossopharyngeal nerve, which also serves the posterior third of the tongue and is at risk in tonsillectomy.

Clinical physiology

  • Shared path for air and food; the soft palate and the larynx redirect them at each swallow.
  • Waldeyer's ring samples antigens at the entry of the airway and gut; the adenoid is large in childhood and shrinks with age.

Clinical correlation

  • Strep pharyngitis: sudden sore throat, fever, painful swallowing, tender anterior neck nodes, palatal petechiae, tonsillar swelling with or without exudate.
  • Cough, runny nose, hoarseness, mouth ulcers and conjunctivitis favour a viral cause.
  • Under 3 years, streptococcal pharyngitis is rare.
  • Adenoid hypertrophy: mouth breathing, snoring, nasal voice and recurrent ear effusions.
  • Earache with a normal ear may be referred from the tonsils or pharynx.
  • Retropharyngeal abscess mainly affects children under 5: fever, drooling, neck stiffness, stridor.

Next step / Initial management

  • Look at the tonsils (size, exudate, asymmetry), the soft palate and uvula position, and palpate the neck nodes.
  • Sore throat without clear viral features: confirm group A streptococcus with a rapid antigen test or culture before antibiotics.
  • Confirmed strep pharyngitis: penicillin V or amoxicillin first line; alternatives for penicillin allergy; analgesia.
  • Refer as an emergency (same day) for drooling, trismus, muffled voice, stridor, neck stiffness or a bulging soft palate (peritonsillar or retropharyngeal abscess).
  • Refer routinely to ENT for recurrent tonsillitis, obstructive sleep symptoms, persistent mouth breathing with ear effusions, or an asymmetric tonsil in an adult.

Test yourself

Think of the answer, then tap the question to see it.

A 5-year-old snores, breathes through the mouth and has had fluid behind both ear drums for months. Which structure links these problems?

An enlarged adenoid (pharyngeal tonsil) on the roof of the nasopharynx, next to the Eustachian tube openings, blocks the nose and impairs tube drainage.

Which features make a viral sore throat more likely than strep throat?

Cough, runny nose, hoarseness, oral ulcers and conjunctivitis. Strep throat typically has sudden onset, fever, tender anterior nodes and tonsillar exudate.

What are the four main components of Waldeyer's ring?

The pharyngeal tonsil (adenoid), the tubal tonsils, the palatine tonsils and the lingual tonsil.

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Educational content; it does not replace a medical assessment and is not a clinical instruction. For a real case, follow current guidelines and specialist advice.

Sources: Anatomy, Head and Neck, Pharynx (StatPearls (NCBI Bookshelf), 2023); Ear Infections in Children (National Institute on Deafness and Other Communication Disorders (NIDCD), NIH, 2022); Clinical Guidance for Group A Streptococcal Pharyngitis (Centers for Disease Control and Prevention (CDC), 2025); Retropharyngeal abscess (MedlinePlus, US National Library of Medicine, 2024).

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Representative model, for educational purposes only.