THE SKELETON OF THE LOWER EXTREMITY 



131 



Cartilage of the crest 

 of the ilium 



Centre of ossification 

 of the ilium 



Primitive cartilage 



3$ Centre of ossification 

 of the ischium 



V, 



FIG. 314. IN THE FIFTH MONTH OF FCETAL 

 LIFE (MONTHS OF FOUR WEEKS EACH). 



Ilium 



Os ilium 



Centre of ossification 

 of the pubis 



Pubis 



Os pubis 



...-Ischium 

 Os ischii 



Cartilage of the crest 

 of the ilium 



Ilium 

 Os ilium 



Y-shaped cartilage 



Ichium 



Os ischii 



FIG. 315. IN THE SIXTH MONTH OF FCETAL 

 LIFE (MONTHS OF FOUR WEEKS EACH). 



FIG. 316. IN THE FOURTH YEAR OF LIFE. 



Cartilage of the crest of the ilium 



Ossification of 



the Y-shaped _?_. 



cartilage 

 Os acetabuli 



Epiphysis of the 

 tuberosity of the ischium 



Anterior inferior 

 spine of the ilium 



Spina iliaca 

 anterior inferior 



. Ossification of the 

 Y-shaped cartilage 



Pubis 

 Os pubis 



Epiphysis of the 

 crest of the ilium 



Line of union of 

 the ischiopubic 



rami 



Epiphysis of the 

 tuberosity of the ischium 



FIG. 317. IN THE FOURTEENTH YEAR OF LIFE. FIG. 318. IN THE SEVENTEENTH YEAR OF LIFE. 



Development of the Hip-Bone. 



172 



