THE SKELETON OF THE UPPER EXTREMITY 



117 



Centres of ossification 

 in the olecranon 



Tuberosity of the ulna 



Tuberositas ulnae 



V, 



Double epiphysis of 

 the olecranon in 

 the act of uniting 

 with the shaft 



V, 



FIG. 269. FROM A BOY AGED 

 THIRTEEN YEARS. 



FIG. 270. FROM A BOY AGED 



SEVENTEEN YEARS. 

 THE DEVELOPMENT OF THE EPIPHYSIS OF THE PROXIMAL EXTREMITY OF THE ULNA. 



Centra of ossification in 

 the head of the ulna 



Epiphysis of the head 

 of the ulna in the 

 act of uniting with 

 the shaft 



FIG. 271. FROM A GIRL AGED FIG. 272. FROM A YOUNG MAN AGED 



Six YEARS. NINETEEN YEARS. 



THE DEVELOPMENT OF THE EPIPHYSIS OF THE DISTAL EXTREMITY OF THE ULNA. 



Centre of ossification in 

 the head of the radius 



Epiphyais of the head of 

 the radius in the act 

 of uniting with the 

 shaft 



Tuberosity of the 



radius 

 "Tuberositas radii 



FROM A BOY AGED FIVE YEARS. FIG. 274. FROM A BOY AGED SEVENTEEN YEARS. 



THE DEVELOPMENT OF THE EPIPHYSIS OF THE PROXIMAL EXTREMITY OF THE RADIUS. 



Centre of ossification in the 

 distal extremity of the 

 radius 



Distal epiphysis of 

 the radius in the 

 act of uniting with 

 the shaft 



Vi Vi 



FIG. 275. FROM A GIRL AGED FIG. 276. FROM A YOUNG MAN AGED 



Two YEARS. NINETEEN YEARS. 



THE DEVELOPMENT OF THE EPIPHYSIS OF THE DISTAL EXTREMITY OF THE RADIUS. 



Development of the Bones of the Forearm. 



