THE EIBS, THE STEENUM, AND THE THOEAX 147 



THE STERNUM. 



The Sternum (Figs. 98, 99) is the long, jointed, cylindrical rod 

 which lies in the ventral middle line of the body opposite the thoracic 



FIG. 99. 



Manubrium, forming Cephalic End of Sternum. 



i 



First Right Rib. 



Second Right Rib / j 



Third Right Rib. 



Fourth Right Rib. 



Fifth Right Rib. , 



Sixth Right Rib. 

 Seventh Right Rib. 



Eighth Right Rib. 

 Ninth Right Rib. 



Tenth Right Rib 



Eleventh Right Rib. j 

 Twelfth Right Rib. - 



Thirteenth Right Rib. 

 (The Floating Rib.) 



Tip of Xiphisternum, funning 

 Caudal En<i \ Sternum. 



THE THORAX, VENTRAL ASPECT. (Natural size.) 



region of the vertebral column. It forms the median portion of the 

 ventral wall of the thorax by furnishing attachment along its sides to 



