38 



THE SKELETON OF THE HORSE 



The first thoracic vertebra has the following specific characters : The body is 

 wide and flattened dorso-ventrally. In front it has a head like the cervical verte- 



SpiiKms jrroce^ 



Articular proccssc 



Arch 



Facet for tubercle of first rib ^ 

 Facet for head of first rib 

 Fig. 14. — First Thoracic Vertebra of Horse, Posterior View. 



Transverse process 

 Body 



brae, and behind a cavity somewhat deeper than any other thoracic vertebra. Two 

 large costal facets are found on either side, and a well-marked spine ventrally. 



Fig. 1-3. — Last Three Thoracic Vertebra of Horse, Left View. 

 1, Body; 2, 2, facets for head of rib; 5, facet for tubercle of rib; 4* 4', articular processes; .5, intervertebral foramen" 



6', mammillary process; 7, spinous process. 



The arch is large and strong, and has large notches. The articular processes are 

 much larger than those of other thoracic vertebrae, and resemble a good deal those 

 of the seventh cervical. The transverse processes are short and thick, and each 



