THE FRAMEWORK OF THE BODY 



41 



length of the column, 

 is made up of twenty- 

 four separate bones, 

 each called a vertebra. 



Of these the first 

 or upper seven lie in 

 the neck and are 

 called cervical verte- 

 brce. 



The next twelve 

 bones of the spinal 

 column are those to 

 which the ribs are 

 attached. They are 

 called the thoracic or 

 dorsal vertebrce. 



Next come the lum- 

 bar vertebrce, which 

 are larger than any 

 other of the movable 

 vertebrae. They sup- 

 port no ribs, but re- 

 ceive many large and 

 strong muscles. 



Below these is seen 

 the sacrum, composed 

 in the infant of five 

 vertebrae, which in 

 the adult become one 

 bone. To the broad 

 spaces on its sides are 

 attached the bones of 

 the pelvic arch which 



Fig. 29. The vertebral column as seen 

 from left side (.4) and from behind (Li). 



C 1-7, D 1-12, L 1-5 cervical, dorsal, and lum- 

 bar vertebrae. 



S sacrum. sp spinous process. 



Co coccyx. ' tr transverse process. 



