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Lingual follicle or crypt. Labels: a, involution of mucous membrane with its papillae; b, lymphoid tissue, with several lymphoid sacs.

Crypt

Lingual follicle or crypt. Labels: a, involution of mucous membrane with its papillae; b, lymphoid tissue,…

A tonsil consists of an elevation of the mucous membrane presenting 12 to 15 orifices which lead into crypts or recesses, in the walls of which are placed nodules of adenoid or lymphoid tissue. Shown is a vertical section through a crypt of the human tonsil. Labels: 1, entrance to the crypt; 2 and 3, the framework or adenoid tissue; 4, the enclosing fibrous tissue; a and b, lymphatic follicles; 5 and 6, blood vessels.

Crypt of Tonsil

A tonsil consists of an elevation of the mucous membrane presenting 12 to 15 orifices which lead into…