594 



PRINCIPLES OF VETERINARY SURGERY 



sue, is found fibrous tissue overrun by dilated blood-ves- 

 sels. This fibrous tissue .contains some round embryonic 

 cells, but they are not arranged along the medullary wall 

 in the form of epithelial osteoplasts, such as occurs in phys- 

 iological ossification. These cavities are not bounded by 

 genuine osseous tissue, but by gaps filled up by shrunken 



.— -o 





Fig. 94. 

 Vertical Section of a Diaphyseal Cartilage of a Rachitic Tibia, in Course of 

 Development. A Large Medullary Cone Sends a Lateral Branch to the 

 Left (m) and is Extended into the Cartilage, ccc. Represent the Peri- 

 phery of the Cone, the Cartilage of which is Undergoing Proliferation 

 and is Exhibiting Cells and Groups of Cells, c'c'. Represents the 

 Capsule of the Cartilage, Thickened and Crumpled in the Interior. At 

 oo They Meet and Form an Ossified Tissue. 



cartilaginous cells and connective tissue cells within the 

 cavities which are lined with complete calcareous incrusta- 

 tion. The cells and their nuclei are small ; the tracts con- 

 taining them are softer than the normal osseous tracts, 

 and microscopically they resemble bone partially decalcified 

 by acids. 



