Abstract
The palatine tonsil is derived from the second pharyngeal pouch endoderm, which, like that of all the pharyngeal grooves, except the first, disappears early in development. A small recess, the tonsillar fossa, develops and the endodermal cells at its fundus proliferate. They are soon invaded by mesodermal cells and the closely associated cells of the two origins form the primordium of the palatine tonsil. A similar aggregation of mesodermal and endodermal cells is found on the first pharyngeal pouch, becoming the tubal tonsil, on the dorsum of the tongue, the lingual tonsil and on the dorsal pharyngeal wall, the adenoids. Thus the lymphoid/ epithelial conjunctions of Waldeyer’s ring are not specifically related to pharyngeal pouches alone, but surround the whole inlet of the foregut.
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© 2001 Springer-Verlag London
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Michaels, L., Hellquist, H.B. (2001). Development; Normal Anatomy; Histology; Inflammatory Diseases. In: Ear, Nose and Throat Histopathology. Springer, London. https://doi.org/10.1007/978-1-4471-0235-9_26
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DOI: https://doi.org/10.1007/978-1-4471-0235-9_26
Publisher Name: Springer, London
Print ISBN: 978-1-4471-1128-3
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