HIP JOINT. 



257 



The connexion of the ribs anteriorly with their cartilages, is 

 such as admits of no motion whatever between them ; but the 

 extremities of the cartilages are articulated with the sternum, at 

 the pits on the edges of that bone.' In many instances there is 

 no appearance of synovia between the ends of the cartilages and 

 the sternum ; but this fluid is mostly to be found in the pits, on 

 the lower extremity of the sternum. 



In the articulations between the cartilages of the ribs and 

 the sternum, there is a synovial membrane, and two ligaments, 

 anterior and posterior. These radiate from the sternal end of 

 the cartilage, one over the anterior, the other over the posterior 

 face of the sternum, and are blended with its periosteum, see 

 fig. 54, p. 245. 



The Hip Joint. 



Fig. 62.* The acetabulum is lined 



with cartilage ; and the 

 brim or margin of it is 

 much enlarged, and the 

 cgvity deepened, by the 

 addition of fibro-cartilagi- 

 nous matter, which forms 

 a regular smooth edge. 

 This cartilaginous ring is 

 continued across the upper 

 part of the notch in the 

 acetabulum ; so that it com- 

 pletes the circular margin 

 of the cavity, but leaves 

 the under part of the notch 

 open. This forms what is 



called the cotyloid ligament. The head of the os femoris is 

 covered with cartilage, but the depression in it is still visible. 



* The ligaments of the pelvis and hip-joint. 1. The lower part of the 

 anterior common ligament of the vertebrae, extending downwards over the front 

 of the sacrum. 2. The lumbo-sacral ligament. 3. The lumbo-iliac ligament. 

 4. The anterior sacro-iliac ligaments. 5. The obturator membrane. 6. Pouparl's 

 ligament. 7. Gimbernat's ligament. 8. The capsular ligament of the hip-joint. 

 9. The ilio-femoral or accessory ligament. 



22* 



