THE SKELETON OF THE UPPE.R EXTREMITY 



113 



Centre of ossifica- 

 tion in the head 

 of the humerus 



Small tuberosity 



/Tuberculum minus 



Centre of ossification 

 in the head of the 

 humerus 



Great tuberosity 



Tuberculum rnaju.^ 



Centre of ossification in the 

 head of the humerus 



Centre of ossifi- 

 cation in the 

 great tuberosity 



..Diaphysis 



Diaphysis 



FIG. 250. FROM A GIRL 

 AGED FOUR MONTHS. 



FIG. 251. FROM A BOY 

 AGED Two YEARS. 



FIG. 252. FROM A BOY 

 AGED THREE YEARS 

 (HORIZONTAL SECTION.) 



THE CENTRES OF OSSIFICATION OF THE PROXIMAL EXTREMITY OF THE HUMERUS. 



Common epiphysis of the 

 proximal extremity 



Epiphysis proximalis 

 communis 



Epiphysial disc 



Synchondrosis 

 epiphyseos 



Diaphysis 

 Diaphysis 



Common epiphysis of the 

 proximal extremity 



Epiphysis proximalis 

 communis 



Remnant of the 

 epiphysial disc 



Diaphysis 



Diuphysis 



FIG. 253. FROM A BOY AGED FIG. 254. FROM A GIRL AGED 



THIRTEEN YEARS. NINETEEN YEARS. 



THE COMMON EPIPHYSIS OF THE PROXIMAL EXTREMITY OF THE HUMERUS. 



Centre of ossification 

 . in the capitellum 

 of the humerus 



FIG. 255. FROM A BOY AGED Two AND A HALF YEARS. 



Olecranon fossa 

 Fossa olecrani 



Centre of ossification of 

 the internal condyle 



Centre of ossification of 

 the trochlea 



Epiphysis of the . 

 internal condyle 



Centre of ossification 

 of the capitellum 



Common epiphysis 

 of the distal 



extremity 



Epiphysis distalis 



communis 



FIG. 256. FROM A BOY AGED 

 THIRTEEN YEARS. 



FIG. 257. FROM A BOY AGED 

 SEVENTEEN YEARS. 



THE EPIPHYSES OF THE DISTAL EXTREMITY OF THE HUMERUS. 



Development of the Humerus. 



