PRINCIPLES OF VETERINARY SURGERY 



635 



The decalcified long bones, on transverse section and 

 stained with safranin f Fleming's Method) do not stain at the 

 lamellas surrounding- the lacunas, but the lamellae of the ec- 

 centric zone stain readily. Sometirties a Haversian system 

 is totally discolored, showing that during life there was a 

 partial decalcification of the osseous lamellfe. In the inter- 

 mediate zone two or three Haversian systems may be fused 

 into one large lacunae. 



The lacunae contain adipose cells, fibrillary connective 

 tissue, and some embryonic cells which either fill up the cav- 







Fig. 101. 

 Deposits of Adipose Tissue During the Periods of Cessation of the Morbid 



Process. 



ity or accumulate around its circumference. Sometimes 

 the cells consist of a single row in immediate contact with 

 the lamellas bounding the lacunae. They are never wanting 

 and are abundant in the lacuna in the course of develop- 

 ment. The outlines of the lacunae are irregular and sinuous. 

 The embryonic cells that fill them increase with each new 

 step of the process. When the process halts they fill with 

 adipose tissue. In this aflfection the normal osseous tissue 

 forming the Haversian systems is transformed into osteoid 

 tissues, that is to say, the lamella are decalcified and exhibit 



