THE VERTEBRAL COLUMN. 7 



facets. Thus from the tenth to the thirteenth thoracic vertebra 

 rotary motion is very limited, owing to the interlocking of the 

 articular processes. 



The Lumbar Vertebrae. Vertebras lumbales (Fig. 5). 

 The last thoracic vertebrae form the transition to the typical 

 lumbar vertebrae. These are larger than the thoracic vertebrae. 



The centra are of the form of the centra of the thoracic vertebrae, 

 and increase in length to the sixth, but the seventh is about 

 the length of the first. They increase in breadth to the last. 



