EPIDERMIC PRODUCTS 



25 



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of such disunion, artificially produced, may seem useless. 

 It is not so, however, for this division of the hoof will 

 permit us to carry out the study of the latter in a clearer, and 

 consequently a more satisfactory, way. The three parts in 

 question are the wall, or crust, the sole, and the frog. 



The wall is that portion of the hoof which we see when the 

 foot rests on the ground. It is a plate of horn which, 

 appUed to the anterior and lateral surfaces of the foot, 

 diminishes in height as it approaches the posterior part of the 

 region. Posteriorly and at each side the wall is folded on 



ll,/'''"'''!i' 



'™ -H.l' 



Fig. 97. — Left Anterior Foot of the Horse : Anterior Aspect. 



I, Outer side ; 2, inner side. 



itself, and is then directed forwards to terminate in a point, 

 after having enclosed the frog, which we will soon study. 



Although the wall forms a continuous whole, it has been 

 divided into regions to which special names are given. The 

 anterior part, from the superior border to the inferior, is 

 called the pince or toe for a width of 4 to 5 centimetres. 

 External to the toe, and on each side of it, for a distance 

 of 3 or 4 centimetres, is the nipple. Behind the nipples are 

 the quarters. Still further back, where the wall folds on 

 itself, forming the buttress, is found the region of the heels. 



