ARTHROLOGY. 109 



these miiscles are found so marked in the horse as to receive 

 the name lumbrici. The lateral ligaments of the fetlock 

 extend from the infero-lateral jmrt of metacarpi magnum 

 almost as high up as the inferior bulbous i^rominence of 

 the splint bone, downwards to the supero-lateral part of 

 OS suffraginis. They are connected together by the capsular 

 ligament, a thick layer of white fibrous tissue attached to 

 the • large metacarpal and suffraginis bones close to their 

 articulatory surfaces ; internally it is lined by the synovial 

 membrane of the joint, externally in contact with extensor 

 pedis tendon, and extensor suffraginis. The annular liga- 

 ment passes from the lateral ligaments behind the flexor 

 tendons, and inferiorly has two bands which blend with 

 perforatus tendon at its bifurcation. 



PASTERN JOINT. 



The inferior articular surface of os suffraginis is main- 

 tained in apposition with the superior surface of os coronse, 

 anteriorly by the tendon of extensor pedis, posteriorly by 

 the long inferior sesamoideal ligament. On each side is 

 a stout lateral ligament, superiorly extending almost half 

 way round the bone from underneath extensor pedis, an- 

 teriorly to the external part of the posterior surface. Its 

 fibres run downwards and backwards, and after covering 

 the inferior attachment of flexor pedis perforatus become 

 attached to the supero-lateral parts of os coronse, some 

 of them being continued on to form one of the divisions 

 of the stellate navicular ligament, others joining with 

 similar fibres from the other side to form a thin fibrous 

 layer, the superior surface of which intimately blends with 

 the perforans tendon ; the inferior gives attachment to the 

 fibrous frog. 



The coffin or pedal joint will hereafter be described. 

 (See Foot.) It has only two ligaments, lateral. 



LIGAMENTS OF THE PELVIS. 



The superspinous ligament in the sacral region is very 

 thick and strong, and anteriorly expands, becoming 

 attached to the postero-superior spinous process of the 

 ilium. It is here continuous with the tendinous structure 

 of longissimus dorsi, and is termed the superior ilio-sacral 

 ligament. Becoming attached along the posterior margin 

 of the ilium, extending from the postero-superior spinous 



