VERTEBRAL COLUMN 



71 



facet for the head of the seventh rib, and by its cephalic surface 

 forms a small ventral and caudal wall to the intervertebral notch. 

 The facet for the head of the rib faces toward the tail and slightly 

 laterally. 



The pedicles (Fig. 48) are perfectly distinct from the body and 

 from the laminae. Their cephalo-caudal diameter is equal to two- 

 thirds of that diameter of the body; their dorso- ventral diameter is 

 equal to half the transverse width of the body. They slope laterally 



FIG. 46. 



Neural Spine. 



Lamina. 



Transverse Process. 



Facet for Tubercle 

 of Rib. 



Cephalic Articular 

 Surjace. 



Body. 



A THORACIC VERTEBRA, ANTERIOR OR CEPHALIC ASPECT. 



and dorsally. The cephalic intervertebral notch is not well marked. 

 The caudal intervertebral notch is deep, has an outline of more than 

 a half-circle, and forms most of the intervertebral foramen. 



The transverse process has a dorsal origin at the junction of the 

 pedicle and the lamina. It is prismatic in form, presenting dorsal, 

 ventral, cephalic, and lateral surfaces, and a caudal border. The 

 dorsal surface is almost square, and gently concave in all directions. 

 It faces toward the tail as well as dorsally. The cephalic surface has 

 the transverse diameter greater than the dorso-ventral diameter. It is 

 limited on the medial side by the cephalic edge of the pedicle, and 

 laterally by the rough, prominent cephalic border of the lateral 

 surface. It is concave transversely, and faces dorsally and toward 



