<prompt> Which of the following is NOT derived from 1st pharyngeal pouch:Middle earEustachean tubeTympanic membranePalatine tonsils  <response>: Ans. d Palatine tonsilsRef. LB. Singh 9th ed. 1118; Fundamental Anatomy By Walter Carl Hartwig 185 First pharyngeal pouch is located between 1st and 2nd pharyngeal arch Palatine tonsil is a derivative of 2nd pharyngeal pouch Eustachean tube, Middle ear, mastoid antrum and tympanic membrane is derived from 1st pharyngeal pouch. 