Figure 5: (a) Microscopic section through the neonatal septum from the sphenoid (left) to columella; caudal end is dislocated (artifact); the diameter of the septal cartilage diminishes from sphenoid to columella by appr. a factor of 9. (Haematoxylin-azophloxin); (b) Schematic representation of thinner and thicker parts of the neonatal septum. (1) ventrocentral area of thin cartilage, (2) sphenospinal and (3) sphenodorsal zone of thick cartilage, (4) sphenoid, (5) anterior nasal spine, (6) vomer anlage. The interrupted line delineates the most superior part of the septum and cartilaginous crista Galli; (2) and (3) represent the growth zones which contribute to the length of nasal dorsum and the size of premailla/maxilla.