THE THORAX 1057 



ninth or tenth costal cartilages. They are pro\4ded with capsular ligaments 

 and synovial membranes. 



3. Sternam. — The manubrium and body are connected by ligamentous 

 fibres, disposed longitudinally in front and behind, and by a plate of fibro- 

 cartilage which is interposed between the articular surfaces. It is to be noted 

 that the entire sternum is strengthened by its dense periosteum, by the 

 radiating fibres of the chondro-stemal ligaments, zmd by the tendinous fibres 

 of origin of the pectoralis major muscles. 



The movements of the ribs are to be studied with the greatest care, and 

 the muscles concerned in these movements are to be specially noted. 



67 



