114 



Articulations of the Hip Bones. 



Zona 

 orbicularis 



156. Articulations of the Hip Bones. Ligaments at 

 the posterior side of the Pelvis. 



The Sympliysis sacro-iliaca is covered on the anterior side, (anterior 

 sacro-iliac ligament), by the Liyamcntwn ilco-lumbalc , which is divided 

 into two portions, and passes outwards from the transverse process of the 

 fifth lumbar vertebra to the ilium (Fig. 154); on the posterior side the 

 Ligamcntum ileo-sacrum lonyum et breve (oblique and horizontal portions of 

 the posterior sacro-iliac ligament) serve as strengthening ligaments. Bet- 

 ween the hip bone and sacrum there are further: the posterior or 

 great sacro-sciatic ligament, Ligamentmn tuber o'so-sacrum, running 

 from the tuberosity of the ischium to the posterior inferior spine of the 

 ilium and to ihe lateral margin of the sacrum and coccyx, and the anterior 

 or lesser sacro-sciatic ligament, Ligamentum splnoso-sacrum, run- 

 ning from the spine of the ischium to the lateral margin of the sacrum 

 and coccyx. These two ligaments help to form the great and lesser sacro- 

 sciatic foramina, Foramen iscliiadicum majus and Foramen iscliiadicum minus. 



