<prompt> Mandible is derived from ?Meckles cailageRitchers cailage4th Pharyngeal pouch6th Pharyngeal pouch  <response>: Ans. is a i.e., Meckles cailageEach half of the mandible ossifies from only one centre which appears at about the 6th week of intrauterine life in the mesenchymal sheath of Meckels cailage near the future mental foramen. Meckles cailage is the skeletal element of first pharyngeal arch. 