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for ligamentoiiR insertion: it is isolated from tlie tubemsity by a 

 narrow part, named the iit-rk, which exhibits a ni^ed fossa foi- the implanta- 

 tion of a ligament. Tho second, situated behind tho head, and smaller than 

 it, is provided with imprints on its margin, and presents an almost Hat 

 diarthrodial facet at tho summit. Each rib articulates by its head and 

 tuberosity with two dorsal vertebra) ; the head is received into the inter 



TY1MCAL KIllS UK TUB 1IOUSK. 



A, Inner face of the fifth sternal rib; 11, External face of thr fust astfinal rili. 

 1, Head of the rib; 2, Its fissure; 3, Neck; 4, Tuberosity ; , r , Articular faivt ; 



6, Scabrous fossa for the insertion of the interosseous oistii-tran.-vrr.-i- ligament ; 



7, Groove on the external face; 8, Vasculo-ncrvous groove of the pi.xt.Tiur 

 border; 9, Prolonging cartilage; 10, A, Artimlar tul-.Tusity for union with thr 

 sternum. 



vertebral articular cavity ; tho tuberosity corresponds, by its facet, to the 

 transverse process of the posterior vertebra. 



The inferior extremity is tuberous and excavated by a shallow cavity, 

 irregular at the bottom, for the reception of tho upper end of tho costal 

 cartilage. 



Structure and development. Tho ribs are very spongy bones, especially 



