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What is Derivative of ultimobranchial body and explain in detail?
PHARYNGEAL POUCH DEVELOPS INTO 1st Tympanic cavity and eustachian tube 2nd Tonsillar epithelium 3rd Ventrally: thymus Dorsally: inferior parathyroid 4th Superior parathyroid 5th Ultimobranchial body The ultimobranchial body will be found attached to pharyngeal pouch 4. It receives some neural crest cells which will form the parafollicular C cell of thyroid gland; which help in the production of hormone calcitonin.