LIGAMENTS OF THE PELVIS. 

 Fig. 62.* 



133 



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 tlie Sacrum and Coccyx. The anterior sacro-coccygean 

 7 igament 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 

 sacrum with the coccyx posteriorly, extending as far as the apex of 

 the latter bone. 



Between the two bones is a thin disc of soft fibrous cartilage. In 

 females there is frequently a small synovial membrane. This articu- 

 lation admits of a certain degree of movement backwards during par- 

 turition. 



* 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- 

 loid ligament of the acetabulum. 7. The ligamentum teres. 8. The cut edge 

 of the capsular ligament, shewing its extent posteriorly as compared with its 

 anterior attachment. 9- The obturator membrane only partly seen. 



