Fig 1.

Drawings from below show the development of the palate from 6 to 7 weeks (A), 7 to 8 weeks (B), and 8 to 10 weeks (C). The lateral palatine processes grow medially and eventually merge in the midline and with the intermaxillary segment (primitive palate). The incisive canal marks the junction of the primitive and secondary palates. (Modified with permission from Levine HL, Clemente MP, eds. Chapter 1, Surgical Anatomy of the Paranasal Sinus. China: 2005. Sinus Surgery Endoscopic and Microscopic Approaches. Figures 1–3. Thieme Medical Publishers Inc., Georg Thieme Verlag Stuttgart).