476 



LIGAMENTS OF THE PELVIS. 



cyx, and ischium, those binding the ossa-pubis together, 

 and those uniting the sacrum and coccyx. 



FIG. 143. The sacro-iliac articulation 



consists of anterior and poste- 

 rior sacro-iliac ligaments. 



The anterior sacro iliac liga- 

 ment is a thin sheet of fibres 

 passing from the ilium to the 

 sacrum on the anterior surface 

 of the joint. 



The posterio sacro-iliac liga- 

 ment is much stronger than the 

 anterior, and forms the chief 

 bond of union between the 

 sacrum and ilium. It consists 

 of numerous strong ligament- 

 ous fasciculi extending transversely and obliquely from 

 the rough surface of the sacrum to the rough surface of 

 the ilium, and to its posterior superior spine. This latter 

 attachment receives the name of sacro-spinous ligament. 



The articular surfaces of the sacrum and ilium are co- 

 vered with cartilage, and have an imperfect synovial mem- 

 brane, more readily distinguished in the young than in 

 the adult, and occasionally lubricated with fluid. 



Sacro-iscliiac articulation. The sacrum and coccyx are 

 united to the ischium by two ligaments, the anterior and 

 posterior s aero-sciatic. 



The anterior or lesser sacro-sciatic ligament arises broad 

 and thin from the side of the sacrum and coccyx, crosses 

 the other, and has a narrow insertion into the spine of the 

 ischium. Its pelvic portion is connected with the coccygeus 

 muscle. 



The posterior or great sacro-sciatic ligament is much larger, 



FIG. 143 represents a front view of the Ligaments of the Pelvis. 1 Ante- 

 rior vertebral ligament, its lower end. 2 Sacro-vertebral ligament. 3 Ileo- 

 lumbar ligament. 4 Sacro-iliac ligament, its anterior portion. 5 Obturator 

 ligament. 6 Poupart's ligament. 7 Gimbernat's ligament. 8 Capsular liga- 

 ment of hip-joint. 9 Accessory ligament of hip-joint. 



