The development of face start from outward growth of tissue located anterior to the cranium & pharynx.
- The upper incisor region and the nose and forehead (frontal region) are formed from the tissue located anterior to the neural tube (frontonasal prominence).
2. The lower jaw and most of the upper jaw are formed by growth of the first pharyngeal (branchial) arch.
The development process proceeds as
— The first pharyngeal/branchial arch grows outward as two processes:
• A lower (mandibular) process grows first and forms the mandible and soft tissue of the lower jaw (right and left processes fuse to form the mandibular symphysis).
• An upper (maxillary) process grows to form most of the upper jaw (caudal
to the incisor teeth).
— And Dorsal to each maxillary process,
A frontonasal prominence expands outward;
it soon becomes divisible into a frontal prominence (which forms frontal
bone of the forehead) and medial & lateral nasal processes(which forms the nose).
PART 2 WILL BE COMING SOON……
( DEVELOPMENT OF NASAL CAVITY )