HORSESHOEING. 



39 



parts of the foot in accordance \vitli their function, location, 

 and structure. 



The two lateral cartilages (Figs. 19, C and 20, b) are 



Fig. 21. 



Fig. 22. 



Plantar cushion seen from be- 

 low: a, base or bulb of the plantar 

 cushion; 6, summit; c, median 

 lacuna or cleft in which lies the 

 "frog-stay" of the horny frog. 



Plantar cushion seen from above: a, base 

 (bulbs) of same; b, summit; c, supensory liga- 

 ment of plantar cushion; d, place at which the 

 elastic ligament connecting the os suffraginis 

 and the lateral cartilage unites with the plan- 

 tar cushion. 



irregular, quadrangular plates, attached to the wings of the os 

 pedis, and extending so far upward and backward that one can 

 feel them yield to pressure on 

 the skin above the coronet, and 

 can thus test their elasticity. 

 The perforans tendon and the 

 plantar cushion lie between 

 the lateral cartilages, and on 

 the sides and behind are par- 

 tially enclosed by them. The 

 internal concave surface of the ^P^^ or point of fleshy frog 



tissue of plantar cushion; d, „ ^.v,.„ 



lateral cartilage (Fig. 20) is which receives the frog-stay of the horny 



Section lengthwise through middle of the 

 plantar cushion: a, glome (bulb) of heels; b, 

 fibro fatty 

 median cleft 



frog. 



attached to the plantar 

 cushion, the os pedis, and the navicular bone, and, like the 

 external, slightly convex surface, is covered with many blood- 

 vessels (veins) Fig. 25, B). 



