ii6 



External parts. The hoof consists of these parts, namely ; 

 The wall or crust of hoof, 

 The horny sole. 

 The frog, 

 The lateral cartilages. 



The wall is divided into — 

 The toe. 

 The quarters. 

 The heels and bars, 

 The superior or coronary border. 

 Inferior or solar border. 

 The horny laminae. 



The sole includes (besides itself which forms the ground 

 surface of the hoof) — 



The bars, which are only parts of the wall turned 



backwards and downwards, 

 The frog and cleft of the frog, 



The commissures and the arch of the commissures. 

 The frog stay. 



The internal parts are made up of — 

 The coffin bone (or os-pedis). 

 The navicular bone, 

 The fatty frog or plantar cushion, 

 The sensitive laminae, 

 The insertion of tendons. 

 Nerves and blood-vessels. 



Immediately above and around the top of the hoof is the 

 coronary band, and underneath it a highly vascular tissue, 

 of which I shall speak hereafter, called the coronary subs- 

 tance. 



The three parts of which the hoof is composed can easily 

 be separated either by maceration or boiling, namely, the 

 wall, the sole and the frog. 



The wall is all that part of the hoof that is visible below 

 the hair when the foot is placed on the ground; it is thicker 



