354 DISEASES OF THE HORSE’S FOOT 
incision along the lower border of the coronary cushion 
(see Fig. 140), afterwards exposing the lower half of 
the cartilage by removing a half-moon-shaped portion of 
the thinned horn and underlying sensitive lamine (see 
Fig. 140, b). 
This done, the external face of the cartilage is separated 
from the skin of the coronet. To do this a double sage- 
knife is run flatwise between the coronary cushion and the 
Fic. 140.—Exciston or tHe Lareran CartTinaGe, (AFTER 
Mouser AnD FRIck.) 
«, The thinned horny wall covering the coronary cushion; }, the lateral 
cartilage exposed by stripping off the thinned wall; c, the sensitive 
lamine. 
cartilage, with the convex surface of the biade towards the 
skin. The knife is then passed backwards and forwards 
until the necessary separation is accomplished. During 
these movements of the knife a finger of the unoccupied 
hand should follow the knife, and guard the coronary 
cushion against injury. 
Following this, the inner surface of the cartilage must be 
also searpated from the structures lying beneath it. To 
