The important roles of the irregular split lines in the split line method

The split line patterns in the various organs became evident by examining 17 species of animals but mainly using red short haired hybrid dogs. Research efforts were centered at the correlative appearance status of the line system and irregular split lines by pursuing the pathological experiments and aging changes, concluded as follows: The line system indicates the growth direction as a whole as well as the static form retaining function. The irregular split lines indicate the buffering action and are classified into 3 kinds. In other words, the split line pattern indicates the growth architecture urged by the forming due to inherent/genital factors and the onset of function due to acquired/environmental factors, and also the growth control-system for the normal growth and the form retaining-system for the onset of normal function as well as the interdependence-system with the muscle. This interdependence-system is a very important mechanism designed for symbiosis of bone and muscle involved and fully assures the sliding and pressure to the articular cartilage, and in the case of lingua for symbiosis of lamina propria and lingual muscles and allows full lingual motion.