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tonsil
Tonsils are collections of lymphoid tissue〔(Stedman's Medical Dictionary entry on Tonsil )〕 facing into the aerodigestive tract. The set of lymphatic tissue known as Waldeyer's tonsillar ring includes the adenoid tonsil, two tubal tonsils, two palatine tonsils, and the lingual tonsil.
When used unqualified, the term most commonly refers specifically to the palatine tonsils, which are masses of lymphatic material situated at either side at the back of the human throat. The palatine tonsils and the nasopharyngeal tonsil are lymphoepithelial tissues located near the oropharynx and nasopharynx (parts of the throat).
==Structure==
Tonsils in humans include, from anterior (front), superior (top), posterior (back), and inferior (bottom):
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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