356 DISEASES OF THE HORSE’S FOOT 
is also carried up into the skin and structures of the 
coronet. This incision severs, from bottom to the top, 
(1) the sensitive lamine covering a portion of the pedal 
bone and a portion of the lateral cartilage, (2) the coronary 
cushion, and (8) the skin of the coronet and such structures 
as lie between it and the cartilage. 
That this incision of the sensitive structures should be 
kept at } inch from the one in the horn has a reason. It 
Fig. 141.—Excision oF THE LatERAL Cartinace. (AFTER BAYER.) 
The horny wall is stripped off over the seat of operation. 
a, Semicircular flap of sensitive laminz, coronary cushion, and skin; 0, the 
lateral cartilage ; c, the sensitive lamine ; d, the coronary cushion. 
is that when this flap is again placed into position (as later 
it will have to be) we have round its circumference a rim of 
soft structures into which to place the sutures. And in 
this connection it is well to advise the operator that the 
thinness of the keratogenous membrane (the laminal portion 
of it) should warn him that the portion of it to be turned 
up—namely, that forming the tip of the flap—should be 
scraped away quite close to the os pedis. Unless this is 
