244 



MANUAL OF HISTOLOGY. 



kanalchen), while the wider spots or nodal points bear the name of lacunae 

 (Knochenhohlen), was formerly held to be the source of deposit of the bony 

 earths an erroneous view, which has perpetuated itself in one of the 

 names just mentioned. 



The lacuTwe (fig. 237) appear in fresh moist bone as oval lenticular 



Fig. 236. Transverse section of the metatarsus of an ox (after 

 Gegenbaur). a, Haversian canals; 6, transversely cut columns of 

 Sharpens system of fibres, whose branches, c, are partly in con- 

 nection with osseous corpuscles. 



cavities, sometimes short and at others more or less elongated, lying with 

 one broad surface towards an Haversian canal. They have a transparent 



Fig. 237. Transverse section of a human bone, a 6, two divided Haversian 

 canals, surrounded by special lamelhe c d; #,/, the general lamellae. 



appearance, and vary considerably in figure. In length they range from 

 0-0181 toO-OSHmm, in breadth from 0-0068 to 0-0135 mm., and in 



