INTERSTITIAL ARTICULATIONS. 



159 



THE INTERSTERNAL JOINTS. 



While the manubrium and the four pieces of the body, or sternebrae, are still 

 separate ossifications in a common strip of cartilage, the structure is greatly strength- 



FiG. 183. 



First rib. 



MANUBRIUM 



V 5i-~' Interarticular ligament 



Chondro-stemal joint 



BODY 



Interchondral joint 

 -ENSIFORM CARTILAGE 



Interchondral ligament 



Longitudinal section through sternum and costal cartilages. 



ened by the thick periosteum, reinforced by the radiating bands from the costal 

 joints and longitudinal fibres before and behind. When the body has become one 

 piece it is separated from the manubrium by the persisting cartilaginous strip. The 



