256 



THE EXTERIOR OF THE HORSE. 



middle is visible the tendons of the flexor metatarsi and of the anterior extensor 

 of the phalanges, g ; inferiorly, the groove, h, of the pulley of the astragalus ; 

 inwardly, the saphena vein crosses this face obliquely from above to below, i; 

 finally, still on its internal part, the unsustained portion of the articular synovial 

 membrane, k. 



b. Posterior Face. This face (Fig. 77, B] is angular and constituted 

 from above downward : by the cord, I, and the point of the hock, a ; the posterior 

 border, a', of the calcaneus and the perforatus tendon. But, viewed from behind, 

 the hock also presents : the profiles of the lateral faces, b, n, c, and d, e, f (the 

 same letters as in the preceding figure) ; the hollow of the hock, m. m, and the 

 chestnut, o. 



c. External Face. This face is limited in front by a line which has, in 

 its middle part, a summit, h (Fig. 77, C), corresponding to the astragaloid 

 trochlea ; behind, the line, forming the profile of this same face, is very angular 

 at the level of the summit of the calcaneus, a, at a point known, in external 

 anatomy, under the name of the point of the hock. Between the latter and the 

 canon are seen successively : the posterior border of the calcaneus, a' ; then the 

 tendon, t ; above the point of the hock is detached, very prominently, the cord 

 of the hock, I, in front of which is seen a deep depression, m, called the hollow of 

 the hock. This face, for the remainder of its extent, is undulated in its middle 

 by three superposed processes: the superior is formed by the infero-external 



FIG. 77. 



tuberosity of the tibia, b ; the middle one, more effaced, is constituted by the 

 base of the calcaneus, n ; the inferior, c, corresponds to the cuboid and the head 

 of the external rudimentary metatarsal bone. 



d. Internal Face. The internal face offers almost the same peculiarities 

 as the external. It shows anteriorly the convexity due to the astragalus, h (Fig. 

 77, D) ; posteriorly, the point, a, the cord, I, and the hollow, m, of the hock ; in 

 the centre and from above downward the infero-internal tuberosity of the tibia, 

 d, the internal tubercle of the astragalus, e, and, finally, the large cuneiform and 

 the head of the internal rudimentary metatarsal bone,/. But on this face are 

 seen, besides : the muscular portion of the deep flexor of the phalanges, which 



