VISCERAL ANATOMY. 17I 



The superior border shows depressions for the villosities of the 

 coronary tissue. 



The inferior border is continuous with the sole, and behind is 

 carried inward as the bars. 



The Sole is a thick, horny plate, forming the inferior face of 

 the hoof. Its inferior face is concave, and its superior has aper- 

 tures for the villi above it. Its outer border is continuous with 

 the external surface of the wall, its inner, as the bars^ lie outside 

 the frog. 



The Frog" is V-shaped, its base behind, apex in front, sepa- 

 rated by a median depression. On either side are lateral depres- 

 sions ; at its base are two lateral elevations, the gloines. It Hes 

 betvveen the bars and below the plantar cushion. 



Structure of Hoof. — Horny tissue, a modification of the epi- 

 dermis. 



