THE TISSUES. 



adjacent systems. In the lamellae adjoining the periosteum and mar- 

 row cavity the canaliculi end respectively in the subperiosteal tissue 

 and in the marrow cavity. The canaliculi of the Haversian lamellae 

 empty into the Haversian canals. 



- I 



> Outer circum- 

 ferential 

 lamellae. 





~^' Haversian or 



concentric 

 lamellae. 



> - > /-^//:<\V ;< 





-Haversian 



' ' v *-r-\" * ' ^ ' H$ canal. 



*j& t , ?> ^ J ' , ' 



- - -'' / , ^ : - , f ' ' 



O> . ' y r ^^'-^~ * 

 1 - j' ..- V/ /- 



' 



."L^i-i ^,-*4_V ^--* Interstitial 



- t r~s j * ^ lamellae. 



,V.-" 



Inner circum- 

 ferential 

 lamellae. 



Fig. 83. Segment of a transversely ground section from the shaft of a long bone, show- 

 ing all the lamellar systems. Metacarpus of man ; y^ 56. 



The lamellae of bone are composed of fine white fibrous-tissue 

 fibrils, embedded in a ground-substance, in which they are arranged 

 in layers, superimposed in such a way that the fibrils in the several 

 layers cross at about a right angle, forming an angle of 45 with 



