<prompt> All are derivatives of first pharyngeal arch exceptMylohyoidTensor tympaniTensor veli palatiniStylopharyngeus  <response>: Derivatives of the first pharyngeal arch aremuscles of mastication chewingmassetermedial and lateral pterygoid musclestemporalismylohyoid muscledigastric muscle, anterior bellytensor veli palatini muscletensor tympani muscleStylopharyngeus belong to 3rd arch 