THE TISSUES. 



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

 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. 



- - - 





- - 







.- ^ - - 



;!;'&,"- 



Outer circum- 

 ferential 

 lamellae. 



- <>A 



* ^ 



o v >-..! 



*<''/ Haversian or 



concentric 

 lamellae. 



I 



'* I 



jjjr*%fc f ^ ' '"'?'<'t, & - 

 ^>'xrv^v, P-: 



,"- ^/^_ - *^-~ '--,,", '- 



CT- '/ V > ' x >*'''. < " 4 ?, * ' 



/' ,':.-?',",:' :.': '--.'o;.. 1 -:- 

 ''^>;^;;.^'fe ;;,';. ^, 



^ O ', .-"- " ^* v i--^ x , ' '.' canal. 



v '. 



' 



' < 

 / 



' '' - ~ ' ~ ~ " ,~ ' " - 



- ' - ^ - 



' ^- u. ; ' -- 



Interstitial 

 lamellae. 



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 ; ^ 5- 



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 



