148 



LIGAMENTS OF THE PELVIS. 



The posterior or greater sacro-ischiatic ligament, considerably larger, 

 thicker, and more posterior than the preceding, is narrower in the middle 

 than at each extremity. It is attached, by its smaller end, to the inner 

 margin of the tuberosity and ramus of the ischium, where it forms a falci- 

 form process, which protects the internal pudic artery, and is continuous 

 with the obturator fascia. By its larger extremity it is inserted into the side 

 of the coccyx, sacrum, and posterior inferior spine of the ilium. 



Fig. 83.* 



Fig. S4.f 



The posterior sacro-ischiatic ligament is in relation in front with the an- 

 terior ligament, and behind with the gluteus maximus, to some of the 

 fibres of which it gives origin. By its superior border it forms part of the 

 lesser ischiatic foramen, and by its lower border, a part of the boundary 

 of the perineum. It is pierced by the coccygeal branch of the ischiatic 

 artery. The two ligaments convert the sacro-ischiatic notches into 

 foramina. 



3. Between the Sacrum and Coccyx. The anterior sacro-coccygean liga- 

 ment is a thin fasciculus passing from the anterior surface of the sacrum to 

 the front of the coccyx. 



The posterior sacro-coccygean ligament is a thick ligamentous layer, 

 which completes the lower part of the sacral canal, and connects the 



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

 mon 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 saero-iliac 

 Mgaments. 5. The obturator membrane. G. Poupart's ligament. 7. Gimbernat's liga- 

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

 ligament. 



j- Ligaments of the pelvis and hip joint The view is taken from the side. 1. The 

 oblique sacro-iliac ligament. The other fasciculi of the posterior sacro-iliac ligaments 

 are not seen in this view of the pelvis. 2. The posterior sacro-ischiatic ligament. 3, 

 The anterior sacro-ischiatic ligament. 4. The great sacro-ischiatic foramen. 5. The 

 lesser sacro-ischiatic foramen. 6. The coty'oid ligament of the acetabuluin. 7. The 

 ligamentum tere*. 8. The cut edge of the capsular ligament, showing its extent poste- 

 riorly as compared with its anterior attachment. 9. The obturator membrane only partly 



