REGIONAL ANATOMY 35 
pyramidal body, where they merge into the velvety tissue 
of the sole and frog. 
The papille of the coronary cushion secrete the horn 
tubules forming the wall, and the papille of the perioplic 
3 
Fig. 18.—Tue Kreratocenous Memsrane (VIEWED FROM BELOW). 
(Tue Hoor REMOVED BY MaAcERATION.) 
1, The sensitive sole; 2, the sensitive frog*—(a) its median lacuna,{(d) its 
lateral lacuna; 3, V-shaped depression accommodating the toe-stay ; 
4, the sensitive laminz which interleave with the horny lamine 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. Tue Veuvety Tissuz.—This is the portion of the 
keratogenous membrane covering the plantar surface of the 
3—2 
