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 laminse covering a portion of the pedal 

 bone and a portion of the lateral cartilage, (2) the coronary 

 cushion, and (3) 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 J inch from the one in the horn has a reason. It 



Fig. 141. — Excision of the Lateral Cartilage. (After Bayer.) 



The horny wall is stipped off over the seat of operation. 



a, Semicircular flap of sensitive laminae, coronary cushion, and skin ; 

 b, the Meral cartilage; c, sensitive laminae; 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 circumferance 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 membrance (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 



