158 PRACTICAL ANATOMY. 



Insertion Rough surface on posterior part of ilium. 

 OBLIQUE. 



Origin Third tubercles of sacrum. 

 Insertion Posterior superior spine of ilium. 



2. ARTICULATION'S BETWEEN THE SACRUM AND ISCHIUM. 

 LIGAMENTS : 



GREATER SACRO-SCIATIC. 



Origin Lower transverse tubercles of sacrum, ad- 

 joining inferior spine of ilium. 

 Insertion Tuberosity of ischium and ramus of 

 ischium ; continued as falciform ligament. 



4 4 



FIG. 72. SACRO-ISCHIATIC ARTICULATIONS. 



1, base of sacrum; 2, coccyx: 3, crest of ilnim: 4, tuberosity of isohinm; 5, greater 

 gacro-sciatic foramen ; fi, capsular ligament of hip-joint ; 7, greater trochanter; 8, posterior 

 ilio-sacral ligament : 9 and 10, himbo-sacral ligaments ; 11, obliqne ligament ; 12, obturator 

 foran.en ; 13 and 14, greater sacro-sciatic ligament ; 15, lesser s cro-sciatic ligament. 



LESSER SACRO-SCIATIC. 



Origin Posterior lateral border of sacrum and 



coccyx. 



Insertion Spine of ischium. 

 3. ARTICULATIONS BETWEEN SACRUM AND COCCYX. 

 LIGAMENTS : 

 ANTERIOR. 



Origin and Insertion Fibres pass from anterior 

 part o-f sacrum to coccyx. 



