Name the structure derived from 2nd pharyngeal pouch and its significance?

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The palatine (or faucial) tonsils.. Commonly referred to as tonsils, are bundles of lymphatic tissue located in the lateral oropharynx. They sit in the isthmus of the fauces, bordered anteriorly by the palatoglossal arch and posteriorly by the palatopharyngeal arch..

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Palatine tonsil develops from endoderm of 2nd pharyngeal arch. Its significance is this that although tonsil develops from endoderm of 2nd pharyngeal pouch but it is supplied by tympanic branch of glossopharyngeal nerve , the pretrematic nerve of 3rd pharyngeal arch.

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Thmpanic branch of glossopharyngeal nerve is also known as Jacobson's nerve

Crypts of palatine tonsils.

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Palatine tonsil

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