PRINCIPLES OF VETERINARY SURGERY 37 



wall. The condition known as "seedy toe" although usually 

 due to pre-existing inflammations ol obscure origin, is a fair 

 sample of the condition produced from traumatic lesions that 

 destroy large areas of the sensitive laminae. 



The scar tissue replacing the lost laminae is, however, al- 

 ways replete with hoof-producing cells that are even more 

 active in hoof-production than the original ones. The hoof 

 producing quality of new laminal tissue is a striking example 

 of augmented cellular activity. The amount of hoof produced 

 is often exuberant, especially when the membrane is not de- 

 stroyed as deep as the periosteum. And even when the bone 

 is laid bare over a considerable surface the regenerative pro- 

 pensities of the region are always strikingly exemplified. 

 When a large portion of the wall is destroyed this mem- 

 brane repairs the breach by coating it over with a rather 

 firm, thick, horny substance, pending the growth of the new 

 wall from the coronary cushion, which permanently covers 

 the defect in time. 



In a word, the regenerative powers of the sensitive lam- 

 inae are great, but the anatomical arrangement of the pleats 

 is never perfectly restored. 



When the velvety tissue is destroyed it is much more 

 prone to resume its normal anatomical and physiological 

 condition than the coronary cushion and sensitive lamina. 

 In fact, most any breach will be replaced by a very active 

 horn-producing tissue that will almost immediately secrete 

 a normal sole or frog. Sometimes the new sole is somewhat 

 spongy, but this only for a very brief period. Within several 

 weeks it can not be distinguished from the original organ. 

 The entire anterior two-thirds of the frog and its matrix may 

 be surgically removed and then be entirely restored to its 

 normal condition, and that within the brief period of two or 

 three months, or even less. 



Hoof-producing cells always abound in the granulation 



