42 



CONNECTIVE TISSUE. 



around these the bone is arranged in rings, lamellae; between 

 these are spaces, lacunae, in which are bone-corpuscles (Fig. 34). 

 Each canal is connected with the lacunae which are concentric 



- 



<*. 



~ I HT'.'.JL: ' 

 M* icrTfrvi T;^*^- 1 r 



ip^^l^pS 



Outer circum- 

 ferential 

 lamellae. 



Haversian or 

 concentric 

 lamellae. 



ll?Rli|S; if 



//, r^^-v*>:^^.s--"' 



Inner circum- 

 ferential 

 lamellae. 



FIG. 33. Segment of a transversely ground section from the shaft of a long 

 bone, showing all the lamellar systems ; metacarpus of man ; X 56 (Bohni and 

 Davidoff). 



with it, and the lacunae with one another by means of fine canals, 

 canaliculi, into which project processes of the bone-corpuscles. 

 A Haversian canal (Fig. 34) with its lamellae, lacunae, bone- 



