16 



THE STRUCTURE OF THE BONES 



FIG. 20. THIRD LUMBAR VERTEBRA IN HORIZONTAL SECTION. 



FIG. 21. SIXTH DORSAL 

 VERTEBRA IN SAGITTAL 

 SECTION. 



FIG. 22. BODY OF THE SECOND LUMBAR VERTEBRA IN FRONTAL SECTION. 



Vertebrae : Substantia compacta et substantia spongiosa ossium Compact and cancellous tissue 



of the bones. 



Ossa brevia Short bones. 



