460 



PRACTICAL ANATOMY. 



5. Blood-supply. Middle sacral and lateral sacral artery. 



6. Ligaments. Anterior sacro-coccygeal ligament, on the front of bodies ; 

 posterior sacro-coccygeal ligament, on posterior part of bodies ; supracornual 

 ligament, a prolongation of the supraspinous ligament ; intertransverse ligament, 

 analogous to the intertransverse ligaments of the true vertebra; ; intervertebral 

 substance of jelly-like cartilage. 



The Sacro-vertebral Articulation and its Ligaments : 



1. Class. Amphiarthrosis between the bodies of the vertebrae. . 



2. Class. Diarthrosis between the articular processes. 



3. Subdivision. Arthrodia, because of a gliding movement. 



4. Osteological Units. Same as between two vertebrae. 



5. Subdivisional Parts. Same as in juxtaposition of vertebrae.. 



Lateral expanded portion 



Median longitudinal band 



Kn:. 332. POSTERIOR COMMON LIGAMENT OF THE SPINE. (Thoracic region.) 

 (Pedicles cut through, and posterior arches of vertebrae removed.) 



6. Nerve-supply. Fourth and fifth lumbar and sympathetic. 



7. Blood-supply. Lateral sacral, last lumbar, ilio-lumbar. 



8. Special Name. Sacro-vertebral angle. 



9. Ligaments of Sacro-vertebral Articulation. (i) Prolongation downward 

 of the ligaments of the vertebral column under the same name. They may be 

 modified to some extent to meet the particular demands of a special region ; for 

 this modification you can account philosophically : growth is the correlative of 

 function. (2) Sacro-lumbar ligament, triangular in shape. (3) Ilio-lumbar liga- 

 ment, triangular in shape. 



THE VERTEBRAL COLUMN AND ITS LIGAMENTS. 

 Of what is the vertebral cohnnn composed .' 

 Of thirty-three irregular bones, called vertebrae. They are classified as true 



