THE CORIUM OF THE HOOF 893 
border and at the angles. Centrally it is continuous with the corium of the frog 
and bars. The deep surface is attached to the sole surface of the third phalanx 
by a modified and highly vascular periosteum. 
Cumedie of skin Cartilage of third 
phalanx 
Position of 
navicular bursa 
Position of 
navicular bone 
Corium of periople 
Coronary coritum ——~ 
Laminar corium 
*— Quitline of hoof 
Fic. 716.—Larerat View oF Foor or Hor 
: ArreR Removat or Hoor anp Part or Sxry. (After Schmaltz, Atlas 
d. Anat. d. Pferdes.) 
Dotted lines in front of navicular bone indicate position of coffin joint. 
5. The corium of the frog (Corium cuneatum)—also called the sensitive frog— 
is moulded on the deep surface of the frog and bears small papilla. Its deep face is 
Perioplic corium Periople of heel or bulb 
Coronary corium 
Laminar corium 
5 Si Angle of wal! 
Corium of frog 
Angle of sole 
Position of navicular bone 
Corium of sole 
Position of insertion of 
deep flexor tendon 
Wh ite line 
Basal border of wall 
Fic. 717—Grovunp Surrace oF Foor oF Horse Arrer Removat or Harr oF Hoor To SHow Corrum. (After 
Schmaltz, Atlas d. Anat. d. Pferdes.) 
blended with the digital cushion. The germinal cells of the frog derive their 
nutrition from this part of the corium. 
