By the end of the sixth week the fusion of the lateral and medial nasal processes and maxillary processes begins the formation of the upper jaw. The midline approximation of the medial nasal processes forms the nasal septum. At the beginning of the seventh week, the tip of the nose is elevated between the medial nasal processes and is visible in profile.
Eyelids become prominent and the pinna of the ear takes shape.
By the end of the seventh week the pattern of facial features has taken on a human appearance. The fusion of the medial nasal processes is complete, forming the central axis of the nose and the philtrum of the lip. All rights reserved.