34 



DISEASES OF THE HOESE'S FOOT 



PeriopUc RiiKj, the cells of which have as then- 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 laminfe. 



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

 (The Hoof removed by Maceration.) 



1. The sensitive lamiufe, or podophyllous tissue ; 2, the coronary cushion ; 

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

 perioplic ring from coronar}^ cushion ; (i. the sensitive 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 lacunar of the 



