Which of the following is derived from Ist arch?: (A) Frontonasal process, (B) Maxillary process, (C) Mandibular process, (D) Both maxillary & mandibular processes
Answer is D. Face is developed from five facial primordia appear as prominences of mesenchyme:?One frontonasal process : Begins as a proliferation of mesenchyme on ventral surface of developing brain.Two maxillary processes : Grow out from the upper end of each first arch.Two mandibular processes : Grow from each first arch.