Mandible is derived from ?: (A) Meckle's cailage, (B) Ritchers cailage, (C) 4th Pharyngeal pouch, (D) 6th Pharyngeal pouch
Answer is A. Ans. is 'a' i.e., Meckle's 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. Meckle's cailage is the skeletal element of first pharyngeal arch.