A. The wall or crust. 



B. Insensitive sole. 



D. Sensitive sole. 



C. Insensitive frog. 



F. Sensitive frog. 



E. Coronary band. 



G. Small pastern bone. 

 H. Great pastern bone. 



I. Flexor perforans tendon. 

 X, Seat of sprain in navicular disease, 

 O. Navicular bone. 

 L. Sensitive laminae. 

 LL. Insensitive laminae. 

 K. Os pedis. 



M. Long inferior sesamoid ligament. 

 N. Extensor pedis tendon. 



The apparent position of the Os pedis pointing down so much at the toe is 

 due to the section being made in the centre of the bone, where it is most concave. 

 The lateral appearance would be flat. 



Fig. 2. 



A — Crust rasped high up. 



