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In anatomy, the pharyngeal tonsil, also known as the nasopharyngeal tonsil or adenoid, is the superior-most of the tonsils. It is a mass of lymphoid tissue located behind the nasal cavity , in the roof and the posterior wall of the nasopharynx , [ 1 ] where the nose blends into the throat .
When used unqualified, the term most commonly refers specifically to the palatine tonsils, which are two lymphoid organs situated at either side of the back of the human throat. The palatine tonsils and the adenoid tonsil are organs consisting of lymphoepithelial tissue located near the oropharynx and nasopharynx (parts of the throat).
The adenoids, also known as the pharyngeal tonsils, are lymphoid tissue structures located in the posterior wall of the nasopharynx. Waldeyer's tonsillar ring is an annular arrangement of lymphoid tissue in both the nasopharynx and oropharynx.
Waldeyer's tonsillar ring (pharyngeal lymphoid ring, Waldeyer's lymphatic ring, or tonsillar ring) is a ringed arrangement of lymphoid organs in the pharynx.Waldeyer's ring surrounds the naso-and oropharynx, with some of its tonsillar tissue located above and some below the soft palate (and to the back of the mouth cavity).
The adenoid is situated toward the rear of the nasal cavity and up behind the soft palate, in contrast to the tonsils, which are visible when one looks straight through the mouth. Similar to tonsilar tissue, the adenoid can be affected by both acute and long-term infections. A persistent infection or inflammation may cause the adenoid to ...
The crypts greatly increase the contact surface between environmental influences and lymphoid tissue. In an average adult palatine tonsil the estimated epithelial surface area of the crypts is 295 cm 2 , in addition to the 45 cm 2 of epithelium covering the oropharyngeal surface.
St. Clair Thompson adenoid curette with cage and guard: used in adenoid surgery.held in dagger holding fashion and passed behind soft palate. Yankauer's nasopharyngoscope: for a direct access or look at the nasopharynx: Yankauer suction tip: double bent sucker; used as a sucker in operations of the mouth Lichtwitz antrum-puncture trocar and canula
Beneath the epithelium and its basement membrane is a fibrous layer infiltrated with lymph corpuscles, so as to form in many parts a diffuse adenoid tissue, and under this a nearly continuous layer of small and larger glands, some mucous and some serous, the ducts of which open upon the surface.