98 BONES OF THE UPPER LIMB. 



extremity in the 4th or 5th year. The upper extremity is formed cJiiefly in 

 connection with the shaft, except the point of the olecranon where a «nall 



Fitr. S5. 



Fig. 85. — Ossification of the R.\nius (R. Quain), 

 A, the radius of a full-gi-owii fcetus ; B, at about two years of age ; C, at five years ; 



D, at about eighteen years. 



1, tlie jirimary piece or shaft ; 2, the ossific point of the lower or carpal epiphysis ; 



3, that of tlie upper end. In D, the ujiper epiphysis is united to the shaft, while the 



lower epiphysis is still separate. 



Fig. 86. 



c 



Fig. 86. —Ossification op the Ulna. (R. Quain). 



A, the ulna of a child at birth ; B, the ulna of a cliild at the end of the fourth year ; 

 €, of a boy of about twelve years of age ; D, the ulna of a male of about nineteen or 

 twenty years. 



1, the primary piece of the shaft ; 2, the nucleus of the lower epiphysis ; 3, the 

 nucleus of the upper epiphysis. In D, the upper epiphysis is united to the' shaft, while 

 the lower one is still separate. 



