36 



HORSESHOEING. 



equals the length of the navicular bone, and it extends upward 

 and do^vnward beyond the bone. Above, it is separated from 

 the sheath of the perforans tendon (" great sesamoid sheath ") 

 by a membranous partition ; below, it passes to the attachment 

 of the perforans tendon to the semilunar crest of the os pedis. 

 (h) There is but one tendon sheath in the foot, — the sheath 

 common to the two flexor tendons (great 'sesamoid sheath). It 



Fig. 17. 



Fig. 18. 



Right forefoot seen from the inner side; d, 

 d', d", d'", great sesamoid sheath; e, mucous 

 bursa beneath anterior extensor tendon of 

 the toe; /, synovial distension of fetlock- 

 joint; 10, inner sesamoid bone; 11, "x" liga- 

 ment; 14, fetlock-joint; 15, lateral cartilage; 

 16, suspensory ligament of lateral cartilage 

 (Ellenberger in Leisering's Atlas and Veteri- 

 nary Anatomy, Sisson, Saunders.) 



Right forefoot seen from the external side ; 

 /. /'i /". /'"■ great sesamoid sheath (tendon- 

 sheath) ; g, mucous bursa beneath anterior 

 extensor tendon of the toe; h, mucous bursa 

 beneath extensor tendon of long pastern; i, 

 synovial distension of the fetlock-joint; 7, 

 suspensory ligament; 9, cannon bone; 10, 

 outer sesamoid bone; 12, fetlock-joint; 13, 

 lateral cartilage; 14, suspensory ligament of 

 the lateral cartilage. (Ellenberger in Lei- 

 sering's Atlas and Veterinary Anatomy, 

 Sisson, Saunders.) 



encloses the flexor tendons from the middle third of the cannon 

 down to the middle of the short pastern, and is intimately united 

 with the flexor pedis perforans tendon (Fig. 17, f, f, f\ f". 

 Fig. 18, d, d', d'', d'"). 



Altering the Relative Tension of the Flexor Tendons and 

 Suspensory Ligament of the Fetlock-Joint. 



The body- weight imposed at the fetlock-joint is supported, 

 in large part, by the suspensory ligament ; somewhat less weight 



