CHAPTER XX. 



HOOF LAMENESS. 



Anatomo -Physiological Review. 



The hoof consists of the horny box and its contents. 

 The horny box shows three portions. The wall is all that 

 part of the horny box Avhich is seen when the foot rests 

 upon the ground. The anterior middle region of this crust 

 is designated the toe, its two sides the outside and inside 

 toe respectively ; the lateral regions constitute the quarters. 

 The heels are formed by the angles of infle(5tion of the 

 extremities of the wall; these extremities pass along the 

 inner border of the sole and are called bars. The inner 

 face of the wall shows white leaves, which dovetail with the 

 laminae of the podophyllous membrane. 



The sole is a thick, horny plate, occupying the inferior 

 face of the hoof. It is united to the inferior border of the 

 wall, forming with it the white line. Its internal border 

 shows a deep V notch corresponding to the bars, also lodging 

 the frog. The frog is an elastic horny pad between the 

 two re-entering portions of the wall. Its external surface 

 shows a shallow excavation in the centre, known as the 

 middle lacuna, separating the two branches of the frog 

 which Join the heels. Laterally the frog is attached to the 

 sole and bars. 



In the interior of the horny box are located, besides 

 the blood vessels, lymph vessels and nerves, the os pedis, 



