REGIONAL ANATOMY 



35 



pyramidal body, where they merge into the velvety tissue 

 of the sole and frog. 



The papillae of the coronary cushion secrete the horn 

 tubules forming the wall, and the papillae of the perioplic 



Fig. 18. — The Keratogenous Membrane (Viewed from Below). 

 (The Hoof removed by Maceration.) 



i, The sensitive sole; 2, the sensitive frog* — (a) its median lacuna, 

 (b) its lateral lacuna; 3, V-shaped depression accommodating 

 the toe-stay; 4, the sensitive laminae which interleave with the 

 horny laminae of the bar. 



* The sensitive frog thinly invests the plantar cushion or fibro- 

 fatty frog, the outline of which is here indicated. 



ring secrete the varnish-like veneer of thin horn covering 

 the outside surface of the hoof. 



2. Tin-: Vei a'kty Tissue. — This is the portion of the 

 keratogenous membrane covering the plantar surface of the 



