206 



THORAX. 



means of the little processes which project from the 

 edges of each bone in a saw-like manner, and inter- 

 lock with one another a sort of union styled in carpen- 

 try dove-tailing. Just below the skull and in front of the 

 spinal column, we observe the bony cage formed by the 

 ribs and breast bone, containing the organs of the chest. 

 Terminating the spine, we find the pelvis a hollow, basin 

 like cavity formed by three large and broad bones. To 

 the chest are attached the upper extremities, and to the 

 pelvis, are attached the lower extremities. On the up- 

 per and posterior side of the chest, and bound down by 

 the powerful muscles of the back, is a broad flat bone 

 terminating above in a short process with an articulating 

 surface, and is called the scapula or shoulder blade. 

 S P 



SP 



C. collar bone. 

 S. shoulder blade. 

 JR. R. ribs. 

 S. T. breastbone. 

 C. A. cartilages. 

 S. P. Spine, 



