THE PELVIS. 



143 



spring from the imprints on the lateral aspect of the os coronas, 

 and are inserted into two depressions at the superior border of 

 the OS pedis, j)artly covered by the lateral cartilages. 



The postero-lateral are continuations of the 

 lateral ligaments of the pastern joint, which, 

 after reaching the os coronas, form an elastic 

 fibrous cord, attached to the upper border of 

 the navicular bone, the two uniting to form 

 the siqyerior or hroacl ligament. They give 

 off short lateral bundles to the retrossal pro- 

 cesses and inner surfaces of the lateral carti- 

 lages. The lateral navicular ligaments con- 

 sist of strong white fibres, which join the angles 

 of the navicular bone to the inner aspect of 

 the lateral cartilages, and the wings of the os 

 pedis. The inferior ligament is an inter- 

 osseous one, which is attached to a roughened 

 groove on the anterior border of the navicular 

 bone and to the semilunar ridge of the os 

 pedis. The synovial niemhrane lines the 

 cavity of the joint, and sends upwards a very 

 large sac along the posterior surface of the 

 median phalanx. Smaller projections are found between the 

 anterior and posterior lateral ligaments. The motion of the joint 

 is that of flexion and extension. 





i-IG. 5S 



Navicular ligaments. 

 a a, Superior, or broad ; 

 h, Inferior ; and c c, Late- 

 ral ligaments. 



Articulatioxs of the Pelvic Limb. 



THE PELVIS. 



Sacro-iliac Articulation. — This is the articular connection 

 between the axial skeleton and the pelvic limb ; it is described 

 both as a diarthrosis and an amphiarthrosis ; it is capable of little 

 motion, and the synovia is small in quantity, if present at all; 

 the joint is formed by the venter of the ilium, and the supero- 

 lateral surface of the sacrum, which articular surfaces are clothed 

 with cartilage, and the union completed by the three sacro-iliac 

 ligaments, inferior, lateral, and superior. The inferior consists 

 of strong bundles of fibres, which envelop the articulation like a 

 strong and irregular capsular ligament, and are attached below to 

 the transverse process of the sacrum, and above to the venter 

 ilii. The swperior sacro-iliac, short and strong, stretches from 



