QS Study

Waldeyer’s Ring

There are several aggregations of lymphoid tissue in relation to the oropharyngeal isthmus that constitutes the waldeyer’s lymphatic ring. The ring acts as the first line of defense against microbes that enters the body via the nasal and oral routes. It was named after the nineteenth-century German anatomist Heinrich Wilhelm Gottfried von Waldeyer-Hartz.

Formation

The most important aggregations are the right and left palatine tonsils laterally, pharyngeal tonsil posteriorly and above, tubal tonsils above and laterally, lingual tonsils inferiorly. It is made up of the tonsils, adenoids, and other lymphoid tissue. It contains lymphocytes that help the body fight infection and disease.

The ring consists of the (from top to bottom):

  • 1 pharyngeal tonsil
  • 2 tubal tonsils
  • 2 palatine tonsils
  • 1 lingual tonsil.

The structures composing this ring are:

  • palatine tonsils (also called the faucial tonsils)
  • adenoid tonsils (nasopharyngeal tonsils)
  • the lateral bands on the lateral walls of the oropharynx
  • lingual tonsils at the base of the tongue.

Waldeyer's Ring 1

Fig:¬†Waldeyer’s Ring

Peculiarities

  1. Subepithelial in position.
  2. No afferent lymph channels.
  3. No definite capsule or partly capsulated.
  4. Located in upper respiratory and alimentary tract.
  5. Increases in size in early years but decreases in adulthood.
Related Study: