SECTION IV 

 VERTEBRAE, RIBS, AND MUSCLES OF TRUNK 



THE vertebrae, thirty-three in number, articulating together, 

 form the spinal column. They are named according to the 

 region in which they are placed : 



Cervical : 7 neck region. 



Dorsal : 12 thoracic region. 



Lumbar : 5 abdominal region. 



Sacral : 5 pelvic region. 



Coccygeal : 4 caudal region. 



Body 



Superior Articular 

 Process 



t J. Spine 



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FIG. 25. A TYPICAL VEKTEBRA. 



The vertebrae are all constructed on the same plan, but differ 

 slightly from one another in the various regions according to 

 their necessities. 



A typical vertebra consists of a body more or less cylindrical 



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