PLATE V. 



THE CUNEIFORM BONES. 



Here the same macerated hock is exhibited as is represented in Plate III; 

 the difference being that, in the Plate before us, a separation by force has 

 been made of the joint at the articulation formed by the two large cuneiform 

 bones: the object being to shew to what extent the caries has affected the 

 articulatory surfaces of these bones. 



Fig. 1, The superior division, includes the astragalus (a) above, joined to the 

 large cuneiform (c, d, b, e) beneath it, which latter presents its under surface 

 to view. The inner and posterior parts (c, d) of the cuneiform bone, while 

 they are, outwardly, incrusted with the exostosis of spavin, inwardly, or within 

 the joint, present a worm-eaten aspect or caries {w, w) ; the outer half of 

 the same articulatory surface (e, e, e) being smooth and normal in condition. 

 Osseous incrustations (/) also extend from the inner side of the bone along 

 the entire of its front border. 



Fig. 2, The superior division, composed of the middle and small cuneiform 

 bones, which, being turned upside down in order that the upper or correspond- 

 ing surface of Ihe middle cuneiform bone might be presented to view, has, of 

 necessity, the inner side to the spectator's right ; while the outer side of the 

 bone, or that which has preserved its sound articulatory condition {e, e), is to 

 his left. 



a, The front of the bone. 



h, h, The posterior parts. 



c c c, The cuboid bone (on the outer side and behind) in a sound condition, with 

 its upper surface turned to view. 



d, d, The small cuneiform bone (on the inner and posterior side) completely 

 buried in the osseous tumour of the spavin ; the incrustation extending round 

 from the inner side upon the front border of the bone. 



w, w, Worm-eaten surfaces or caries of the middle and small cuneiform bones, 

 shewing plainly the connexion between the exostosis outside the joint and the 

 caries within it. 



w, w, 



