The evolution of the nasal septum and the formation of septal deformity.

Morphological abnormalities of the nasal cavity, particularly of the nasal septum, were interpreted from the viewpoint of evolution. Septal deformity was explained to be an inevitable condition resulting from the autonomic growth force of the septal cartilage, which exists from the earliest mammals; the relationship of the septal cartilage with the vomer supporting it from below; the regression of the maxillo-facial cranium and the enlargement of the neurocranium after the primate stage; and the changes in the cranial base. Therefore, the author proposed that septal deformity was a paradox which occurred as a result of evolution.