SACRO-1LIAC. 



203 



The posterior sternal ligament is disposed in a somewhat similar manner on th& 

 posterior surface of the articulation. 



VIII. ARTICULATIONS OF THE PELVIS WITH THE SPINE. 



The ligaments connecting the last lumbar vertebra with the sacrum are similar 

 to those which connect the segments of the spine with each other, viz. : 1. The 

 continuation downwards of the anterior and posterior common ligaments. 2. The 

 iutervertebral substance connecting the flattened oval surfaces of the two bones, 

 thus forming an amphiarthrodial joint. 3. Ligamenta subflava, connecting the 

 arch of the last lumbar vertebra with the posterior border of the sacral canal. 

 4. Capsular ligaments connecting the articulating processes and forming a double 

 arthrodia. 5. Inter-spinous and supra-spinous ligaments. 



The two proper ligaments connecting the pelvis with the spine are the lumbo- 

 sacral and lumbo-iliac. 



The Lumbo-sacral Ligament (fig. 127) is a short, thick, triangular fasciculus, 

 connected above to the lower and front part of the transverse process of the last 

 lumbar vertebra, and, passing obliquely outwards, is attached below to the lateral 



Fig. 128. Articulations of Pelvis and Hip. Posterior View. 



ANTERIOR , LCf SCR 



SACBO-SCIATIC LICX. 



surface of the base of the sacrum, becoming blended with the anterior sacro-iliac 

 ligament. This ligament is in relation in front with the Psoas muscle. 



The Lumbo-iliac Ligament (fig. 127) passes horizontally outwards from the 

 apex of the transverse process of the last lumbar vertebra, to that portion of the 

 crest of the ilium immediately in front of the sacro-iliac articulation. It is of a 

 triangular form, thick and narrow internally, broad and thinner externally. It is 

 in relation, in front, with the Psoas muscle ; behind, with the muscles occupying 

 the vertebral groove ; above, with the Quadratus lumborum. 



