38 MANUAL FOR ARMY HORSESHOERS. 



30. The horn sea'eting structures of the foot cover the bones and 

 elastic structures. This tissue, the corium, of the hoof, is highly- 

 vascular and is a modified form of the true skin, or dermis. It 

 develops the horn, which is a modified form of the epidermis. It 

 is a continuous structure, bat for description is divided into the 

 perioplic corium or ring, coronary corium or band (Pis. VII and VIII), 

 laminar corium (sensitive laminae, PI. VII), the corium of the sole 



Cut edge of skin 



Corium of periople 



Coronary corium 



Laminar corium 



Outline of hoof 



Plate VII.— Lateral View of Foot of Horse after Removal of Hoof and 

 Part of Skin. 



Dotted lines in front of navicular bone indicate position of coffin joint. (After 

 Schmaltz, Atlas d. Anat. d. Pferdes.) 



(From Sisson's Anatomy of the Domestic Animals; copyright, W. B. Saunders Co.) 



(sensitive sole, Pis. IV and VIII), and the corium of the frog (sensitive 

 frog, PL VIII). All except the sensitive laminae are covered A^ith 

 fine villi which secrete different parts of the hoof. 



The perioplic corium or ring is a narrow band of tissue just below 

 the hair at the coronet and above the coronary band. At the heels 

 it ^^idens and blends with the corium of the frog (sensitive frog). 

 It secretes the periople, the external covering of the wall. 



