WOUNDS 



233 



portions of the secreting layer of the keratogenous mem- 

 brane are destroyed, or perhaps only temporarily prevented 

 from fulfilling their horn-producing functions, then corre- 

 sponding cavities in the horn are the result (see Fig. 109). 



(b) Pit nil cut Arthritis. — Only too readily the pus so 

 formed tends to penetration of the articulation and the 

 causation of an incurable arthritis (see Chapter XII.). 



( c) Necrosis of the Extensor Pedis. — This may arise 

 either as a result of spreading purulent infection of the 



Fig. 109. — Mesial Section of a Hoof illustrating the Conditions 

 following upon Coronitis. 



a, Cavity in the horn of the wall; b, enlargement of the coronet 

 and the horn of the wall following subcoronary suppura- 

 tion: c, cavity in the wall following purulent inflammation 

 of the sensitive laminae; d, hollow in the # horn of the sole 

 consequent upon suppuration of the sensitive sole. 



coronary cushion, or as a result of direct injury immedi- 

 ately over it. The close relation of the terminal portion of 

 this tendon with the pedal articulation, and the incomplete 

 protection from outside injuries here afforded to the joint 

 by the horny box, sufficiently points out the gravity of the 

 condition. 



(d) Penetration of the Articulation. — This also may be a 

 result either of the inroads made by pus, or of an actual 

 wound. When occurring from the latter, it is seen more 

 often than not in the hind-foot, being there caused by the 



