THE VERTEBRAL COLUMN 517 



In some cases the neuro-central synchondrosis may persist, 

 especially in the lumbar region. In the interpretation of 



FIG. 157. Kyphosis, produced by Tuberculous Disease of Thoracic 

 Vertebras. (From a specimen with ribs removed. ) 



radiograms of the vertebral column, care must be taken not 

 to mistake this anomaly for a fracture. 



Five secondary centres appear at puberty, and the epiphyses 

 so formed unite with the rest of the bone at twenty-five. They 

 are placed at the extremities of the spine and the transverse 



