<prompt> Crypta Magna is the remnant ofFirst Pharyngeal pouchSecond Pharyngeal pouchThird pharyngeal pouchFouh pharyngeal pouch  <response>: Medial surface of each tonsil has 15-20 crypts, the largest of which is called Intratonsillar cleft or crypta Magna which represents the persistence of the ventral poion of the second pharyngeal pouch.Ref: PL Dhingra, Diseases of Ear, Nose Throat, 7th edition, pg no. 291 