Medicine and Health related Information

The palatine tonsil develops in relation to the lateral parts of the second pharyngeal pouch. The lymphoid tissue migrate and proliferate and form the lymphoid tissue. The surrounding mesoderm forms the connective tissue stroma for the tonsil. The lining endoderm becomes stratified squamous non-startified squamous non-keratinizing lining epithelium for the tonsil. These lining epithelium dips into the developing tonsils and forms tonsillar crypts.

The intra tonsillar clefts (or ) tonsillar fossa is believed to represent a persisting part of second pharyngeal arch.
Similar lymphoid tissue develops in the endodermal pouch and forms tubal tonsil.
Similar lymphoid tissue develops from the dorsum of the tongue and forms lingual tonsil.
Similar lymphoid tissue develops from the wall of the pharynx i.e, forms pharyngeal tonsil.
The lymphoid organ that is only lined by epithelium is the tonsil.