LIGAMENTS OF THE PELVIS. 



115 



Fig. 50.* 



2nd, Between the sacrum and iscfiium. 

 Sacro-ischiatic anterior (short), 

 Sacro-ischiatic posterior (long). 



3rd, Between the sacrum and coccyx. 

 Sacro-coccygean anterior, 

 Sacro-coccygean posterior. 



4th, Between the ossa pubis. 

 Anterior pubic, 

 Posterior pubic, 

 Superior pubic, 

 Sub-pubic, 

 Interosseous fibro-cartilage. 



1. Between the Sacrum and Ilium. The anterior sacro-iliac liga- 

 ment consists of numerous short ligamentous fibres, passing from 

 bone to bone on the anterior surface of the joint. 



The posterior sacro-iliac or interos- 

 seous ligament] is composed of nume- 

 rous strong fasciculi of ligamentous 

 fibres, which pass horizontally be- 

 tween the rough surfaces, in the pos- 

 terior half of the sacro-iliac articula- 

 tion, and constitute the principal 

 bond of connexion between the sa- 

 crum and the ilium. One fasciculus 

 of this ligament, longer and larger 

 than the rest, is distinguished, from 

 its direction, by the name of the ob- 

 lique sacro-iliac ligament. It is at 

 tached by one extremity, to the pos- 

 terior superior spine of the ilium; 

 and by the other, to the third trans- 

 verse tubercle on the posterior sur- 

 face of the sacrum. 



The surfaces of the two bones 



forming the sacro-iliac articulation, are partly covered with carti- 

 lage, and partly rough and connected by the interosseous ligament. 

 The anterior or auricular half is coated with cartilage, which is 

 thicker on the sacrum than on the ilium. The surface of the car- 

 tilage is irregular, and provided with a very delicate synovial mem- 



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

 mon ligament of the vertebrse, 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. Poupart's ligament. 7. Gimbernat's 

 ligament. 8. The capsular ligament of the hip-joint. 9. The ilio-femoral or acces- 

 sory ligament. 



t This includes Horner's sacro-spinous ligament. G. 



