LECTURE V 



THE FOOT 



The foot, technically, includes all structures at and below 

 the knee in front and the hock behind. This lecture only deals 

 with that portion of the foot below the ankle. 



Bones. — First phalanx ; two sesamoid bones ; second phalanx ; 

 navicular bone ; and third phal- 

 anx. For first and second phal- 

 anges, sesamoids, and navicular, 

 see Lecture III. 



The third phalanx is an irregu- 

 lar bone of loose spongy texture. 

 The body is shaped somewhat 

 like the hoof and shows at the 

 top in front a prominence called 

 the pyramidal process, and on 

 each side a projection called the 

 wing, under which may be seen a 

 groove, through which groove an 

 artery passes on its way to form 

 part of an arch within the sub- 

 stance of the bone. From this 

 arch are given off the branches 

 which distribute nourishment to 

 the vascular parts. Above the 

 wings, inside the hoof, are cavi- 

 ties into which the lateral car- 

 tilages fit. They are of firm 

 cartilage and may be felt above 

 the crown of the hoof on each 

 side. They are attached below 



to the wings of the third phalanx and plantar cushion. To the 

 front and sides of the third phalanx are attached the sensitive 

 laminae. The inferior surface is concaved to receive the sensi- 

 tive sole, or velvety tissue. 



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Fig. 13. — Boxes of the Horse's 

 Foot. 



1, Metacarpal; 2, sesamoids; 

 3, first phalanx; 4, second pha- 

 lanx; 5, navicular bone; 6, third 

 phalanx (os pedis) ; 7, basilar 

 I)rocess; 8, 8, wings; 9, pyramidal 

 process. 



