20 



THE STRUCTURE OF THE BONES 



Joint-cavity 



Layers of the perichondrium 



Calcified cartilage 

 (Centre of ossification of the 



diaphysis) 



Cortex of bone formed be- 

 neath the perichondrium 



Primitive cartilage 



Capsule of the joint 

 Primitive cartilage 



Zone of ossification 



- Endochondrally formed 

 bone of the diaphysis 



Nutrient artery 

 Primary medullary space 



Cortical substance 

 (Periosteal bone of the 

 diaphysis) 



- Layers of the periosteum 



Perichondrium 



FIGS. 29 AND 30. Two STAGES IN THE INTRACARTILAGINOUS OSSIFICATION OF LONG BONES, 



AS SHOWN BY LONGITUDINAL SECTIONS OF THE PHALANGES OF A HUMAN F(ETUS. 



Articular cartilage 



Cartilage of the 



epiphysis 

 Centre of ossification 



of the epiphysis 



Zone of ossification of 



the diaphysis 



Diaphysis 

 Medullary canal 



Epiphysis 



Epiphysial disc 

 Synchondrosis epiphyseos 



Zone of ossification of the 

 diaphysis 



Diaphysis 



Cancellous tissue 

 Substantia spongiosa 

 Compact tissue 

 Substantia compacta 

 Periosteum 



FIGS. 31 AND 32. Two STAGES IN THE INTRACARTILAGINOUS OSSIFICATION OF THE 

 EPIPHYSIS OF A LONG BONE, AS SHOWN BY LONGITUDINAL SECTIONS OF THE 

 DISTAL PORTIONS OF METACARPAL BONES. 



Development of the Bones. 



