78 



HISTOLOGY. 



often run elastic fibres to the lamellated bone substance. These 

 may combine with the Sharpey's fibres or remain independent. 

 In the intercellular substance there are small spaces (13-31 p 

 long, 6-15 // wide, 4-9^ deep). These bone lacunce or bone 

 cavities (formerly incorrectly called bone corpuscles) lie, as a 

 rule, among the longitudinally disposed lamellar fibres. Their 

 shape is variable, and is dependent on the direction of the sec- 

 tion studied. They possess numerous very fine processes, the 



FIG. 43 



From a section through the bone of a roebuck. The bone cavities are seen from above, 

 and are filled with coloring-matter. In places small dots are visible, which represent the 

 cross-sections of bone canaliculi. x 850. 



so-called primitive tubules or bone canaliculi, by means of which 

 not only adjacent, but also distant lacunae, are placed in com- 

 munication with one another. The lacunae lying near Haver- 

 sian canals, the medullary cavity, or the surface of the bone, 

 send canaliculi which enter the canals or the medullary cavity, 

 or open out under the periosteum at the surface of the bone. 

 In this way there is an anastomosis not only between all the 



