LIGAMENTS AND MUSCLES OF THE HORSE. 1*7 



extensor pedis tendon, forming with it the so-called broad 



ligament. 

 -2. Inferior.— Consistmg of three portions : - 

 (a.) Su.^erficial or F 67^ a^^ecZ -Attached above to the base of 



the sesamoids and inter-sesamoidean ligament, below, to the 



glenoidal libro-cartilage behind the upper end of the os 



nclai noro-cartiiage uguhkx mc^ yx^^^^ -. ^ coi 



ona3. 



(b.) Middle or V Shaped.- Atts.che& above to the base of the 

 sesamoids, l^elow, to ridges on the posterior surface of the 

 OS sufFraginis. 



(c.) Deep or X Shaped. -Fixed to the base of the sesamoids and 

 the supero-posterior surface of the os suffraginis. ^ 



3. Lateral (2).— Each passes from the external surface of the 



sesamoid to the upper extremity of the os suffraginis. 



4. latersesarnoideMn.-A pad of fibro-cartilage which unites the 



sesamoids, and with them forms a pulley for the passage 

 of the flexor tendon. 

 Synovial Membrane. 



This is supported in front by the anterior ligament, and later- 

 ally by the lateral ligaments. Posteriorly, it is supported 

 in its lower part by the deep inferior sesamoidean liga- 

 ment, but in its upper part it is unsupported, and conse- 

 quently may bulge upwards between the branches of the 

 suspensory ligament. 

 Movements. 



Flexion and extension are the only natural movements. But 

 if the joint is flexed, slight lateral movement may be pro- 

 duced. 



PASTERN -JOINT. 



(Proximal interphalangeal.) 

 1 Za^em/.— Each of these stretches from the side of the distal 

 extremity of the os suffraginis to the side of the proximal 

 extremity of the os corona?. 



