202 



ARTICULATIONS. 



ARTICULATION OF THE CARTILAGES OF THE RIBS WITH EACH OTHER. 



The cartilages of the sixth, seventh, and eighth ribs articulate, by their lower 

 borders, with the corresponding margin of the adjoining cartilages, by means of a 

 small, smooth, oblong-shaped facet. Each articulation is inclosed in a thin 

 capsular ligament, lined by synovial membrane, and strengthened externally and 

 internally by ligamentous fibres (intercostal ligaments), which pass from one 

 cartilage to the other. Sometimes the cartilage of the fifth rib, more rarely 

 that of the ninth, articulates, by its lower border, with the adjoining cartilage 

 by a small oval facet ; more frequently they are connected together by a few 

 ligamentous fibres. Occasionally, the articular surfaces above mentioned are found 

 wanting. 



ARTICULATION OF THE RIBS WITH THEIR CARTILAGES. 



The outer extremity of each costal cartilage is received into a depression in the 

 sternal end of the ribs, and held together by the periosteum. 



Fig. 127. Articulations of Pelvis and Hip. Anterior View. 



of r o mmu nteutui 7* 

 .Hii rsu of PSOAS &. ILIACLJ 



VII. LIGAMENTS OF THE STERNUM. 



The first and second pieces of the Sternum are united by a layer of cartilage 

 which rarely ossifies, except at an advanced period of life. These two segments 

 are connected by an anterior and posterior ligament. 



The anterior sternal ligament consists of a layer of fibres, having a longitudinal 

 direction; it blends with the fibres of the anterior costo-sternal ligaments on 

 both sides, and with the aponeurosis of origin of the Pectoralis major. This 

 ligament is rough, irregular, and much thicker at the lower than at the upper part 

 of the bone. 



