Editing Adenoid (section)

==Structure==
The adenoid is a mass of [[Lymphatic tissues|lymphoid tissue]] located behind the nasal cavity, in the roof and the posterior wall of the [[nasopharynx]],<ref name=":0" /> where the nose blends into the throat. The adenoid, unlike the [[palatine tonsil]]s, has [[pseudostratified epithelium]].<ref>{{KansasHistology|lymphoid|lymph06}}</ref>  The adenoids are part of the so-called [[Waldeyer's tonsillar ring|Waldeyer ring]] of lymphoid tissue which also includes the palatine tonsils, the [[lingual tonsils]] and the [[tubal tonsils]].

=== Development ===
Adenoids develop from a subepithelial infiltration of [[lymphocytes]] after the 16th week of embryonic life. After birth, enlargement begins and continues until ages 5 to 7 years.

=== Function ===
Part of the immune system, adenoids trap and recognize pathogens such as bacteria and viruses. In response, the adenoid produces [[T cell]]s and [[B cell]]s to combat infection, contributing to the synthesis of IgA [[immunoglobulin]]s, assisting in the body's immunologic memory.<ref>{{cite journal |title=Anatomy, Head and Neck: Adenoids |url=https://www.ncbi.nlm.nih.gov/books/NBK538137/ |website=National Library of Medicine |date=2023 |pmid=30844164 |access-date=2 June 2023 |last1=Mnatsakanian |first1=A. |last2=Heil |first2=J. R. |last3=Sharma |first3=S. }}</ref>

=== Microbiome ===
Species of bacteria such as [[lactobacilli]], anaerobic streptococci, [[actinomycosis]], [[Fusobacterium]] species, and [[Nocardia]] are normally present by 6 months of age. Normal flora found in the adenoid consists of [[alpha-hemolytic streptococci]] and [[enterococci]], [[Corynebacterium]] species, [[coagulase-negative staphylococci]], [[Neisseria]] species, [[Haemophilus]] species, [[Micrococcus]] species, and [[Stomatococcus]] species.{{Citation needed|date=May 2018}}