14b 



THE SKELETON OF THE LOWER EXTREMI'lY 



Centre of ossification 

 of the calcaneum 



Centre of ossification 

 of the astragalus 



Centre of ossification 

 of the cuboid bone 



Formation of the shafts 

 of the medial phalanges 



FIG. 371. FROM A HUMAN FCETUS IN THE 

 MIDDLE OF THE NINTH MONTH (MONTHS 

 OF FOUR WEEKS EACH). 



Body-length, 174 inches. 



Centre of ossification 

 of the calcaneum 



_ Centre of ossification 

 of the astragalus 



FIG. 372. FROM A BOY STILL-BORN 



AT FULL TERM. 



Body-length, 22 inches. 



Centre of ossification 

 of the cuboid bone 



Centre of ossification 

 of the cuboid bone 



Centre of ossification 

 of the external 

 cuneiform bone 



Centre of ossification 

 of the external 

 cuneiform bone 



Centre of ossification 

 of the internal 

 cuneiform bone 



Centre of ossification 



of the base of the 



first metatarsal 



bone 



Centres of ossirication 



in the proximal 



extremities of the 



phalanges 



FIG. 373. FROM A BOY AGED 

 TWELVE WEEKS. 



FIG. 374. FROM A BOY AGED 

 THREE YEARS. 



Development of the Bones of the Foot. 



