34 



DISEASES OF THE HORSE'S FOOT 



Perioplic Ring, the cells of which have as their function 

 the secreting of the Periople, a layer of thin horn to be 

 noted afterwards as covering- the external face of the wall. 

 From the perioplic ring the cushion is separated by a 

 narrow and shallow, though well-marked, groove. 



The inferior border is bounded by the sensitive laminae. 



Fig. 17. — The Keratogenous Membrane (Viewed from the Side). 

 (The Hoof removed by Maceration) 



i . The sensitive laminae, or podophyllous tissue ; 2, the coronary cushion ; 

 3, the perioplic ring; 4, portion of plantar cushion; 5. groove 

 separating perioplic ring from coronary cushion ; 6. the sensi- 

 tive sole. 



The upper portions of the laminae, those in contact with 

 the cushion, are pale in contrast with the portions imme- 

 diately below, and thus there is given the appearance of a 

 white zone adjoining the inferior border of the cushion. 



Widest at its centre, the cushion narrows towards its 

 extremities, which, arriving at the bulbs of the plantar 

 cushion, bend downwards into the lateral lacunae of the 



