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Fusion of lateral nasal process with maxilla bone will form A- nostrils. B- maxillary sinus.

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Anatomical structures are more diverse in the mouth than in any other region. The human face begins to form during the 4th week of embryonic development. By the 6th week the external face is completed.  Between the 6th and 8th weeks the development of the palate subdivides nasal and oral cavities.  This development continues into the 12th week with completion of the soft palate. 3. DEVELOPMENT OF FACE • Face develops from 3 prominences that surround the stomatodeum 1. One frontonasal process 2. Right and Left maxillary processes (from first pharyngeal arch) • 3- Right& left Mandibular processes (from the first pharyngeal arch). •N. B. Stomodeum is a depression bounded cranially by a bulging produced by the brain and caudally by a bulging produced by the pericardial cavity. * From each side of lower part of frontonasal process two mesodermal processes appear called medial& lateral nasal processes (they will give the nasal cavities in the future. 4. Maxillary process DEVELOPMENT OF FACE Mandibular process Mandibular process Maxillary process Fronto-Nasal process.
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