STERNOCOSTAL ARTICULATIONS 



303 



ing a thick fibrous membrane (membrana sterni) which envelopes the sternum. 

 This is more distinct at the lower than at the upper part of the bone. 



The Interarticular Sternocostal Ligament (ligamentum sternocostale inter articular e; 

 interarticular chondrosternal ligament}. This ligament is found constantly only 

 between the second costal cartilages and the sternum. The cartilage of the second 



The synovial cavities are exposed by 

 a coronal section of the sternum and cartilages 



Cartilage continuous with 

 sternum 



Interarticular ligament and 

 two synovial membranes 



Interchondral 



synovial 

 membranes 



Single synovial 

 membrane 



FIG. 315. Sternocostal and interchondral articulations. Anterior view. 



rib is connected with the sternum by means of an interarticular ligament, attached 

 by one end to the cartilage of the rib, and by the other to the fibrocartilage which 

 unites the manubrium and body of the sternum. This articulation is provided 

 with two synovial membranes. Occasionally the cartilage of the third rib is con- 

 nected with the first and second pieces of the body of the sternum by an interartic- 

 ular ligament. Still more rarely, similar ligaments are found in the other four 



