Abstract
1. It was demonstrated in experimental animals that striking blows to the external nose caused similar processes in the development of malformations as seen in wrestlers and boxers. Incessant light blows to the nose of a guinea pig produced results similar to the thickened dorsal surfaces of noses in wrestlers and boxers, and incessant strong blows to a guinea pig resulted in appearances corresponding to the advanced traumatic malformations seen in wrestlers and boxers.
2. Of the various types of traumatic malformation occurring in wrestlers and boxers, slant and curl noses could net be found in guinea pigs. The traumatic protuberances due to fracture of cartilage observed in wrestlers and boxers develop on the line joining the nasion and nasospinole, but in guinea pigs they occur in the upper one-third portion as revealed by study of vertical sections. It is considered that this difference arises from the dissimularity of anatomical structures in humans and experimental animals.
