430 



and above. 



Subpubic 

 ligament. 



How to 

 show disc. 



DISSECTION OF THE PELVIS. 



The superior ligamentous fibres fill the interval between the bones 

 above the disc. 



The subpubic ligament (ligamentum arcuatum ; fig. 159, d) is a 

 strong triangular band occupying the angular interval between 

 the pubic rami at the lower part of the symphysis. Its apex is 

 continuous with the fibrous portion of the interpubic disc ; its 

 base is free and concave, and forms the summit of the subpubic 

 arch. 



Dissection. The disc will be best seen by making a transverse 



FIG. 159. LIGAMENTS OP THE SYMPHYSIS PUBIS, THYROID FORAMEN, 

 AN1> ACETABULUM. 



a. Anterior ligament of the sym- 

 physis. 



b. Obturator membrane. 



c. Interpubic disc, with a slit in 

 the middle. 



d. Subpubic ligament. 



e. Surface of the acetabulum 

 covered with cartilage. 



/. Fatty substance in the aceta- 

 bulum ( " gland of Havers ") 



g. Cotyloid ligament, which is cut 

 where it forms part of the transverse 

 band over the notch. 



h. Deep part of the ligament over 

 the cotyloid notch. 



Interpubic 

 disc : 



cleft in it. 



section of the bones, which will show the disposition of the anterior 

 ligament of the articulation, and the thickness of the plate, with its 

 toothed mode of attachment to the bone ; and when another 

 opportunity offers, a vertical section may be made. 



The interpubic disc consists of a layer of cartilage on each side, 

 which is firmly adherent to the ridged surface of the bone, and a 

 fibrous portion in the middle. The fibrous part is thickest in 

 front ; and at the upper and back portion of the symphysis there 

 is generally a fissure, produced by the absorption of the fibrous 



