RIBS. 



119 



touch any plane surface upon which it may be laid. The shaft is not horizontal, 

 like that of the first rib ; its outer surface, which is convex, looking upwards and 

 a little outwards. It presents, near the middle, a rough eminence for the attach- 

 ment of part of the first, and the second serration of the Serratus magnus. The 

 inner surface, smooth and concave, is directed downwards and a little inwards ; it 

 presents a short groove towards its posterior part. 



The tenth rib (fig. 79) has only a single articular facet on its head. 



Peculiar Ribs. 



Fig. 77. 



Fig. 78 



Fig. 79. 

 Si-nale ttTticular fnctt 



Fig. 80. 



Fig. 81. 

 wrtic. fac. 



The eleventh and twelfth ribs (figs. 80 and 81) have each a single articular facet 

 on the head, which is of rather large size ; they have no neck or tuberosity . and 

 are pointed at the extremity. The eleventh has a slight angle and a shallow 

 groove on the lower border. The twelfth has neither, and is much shorter than 

 the eleventh. 



