18 LIGAMENTS AND MUSCLES OF THE HORSE. 



(Anteriorly the tendon of the extensor pedis acts as a liga- 

 ment, and posteriorly the gienoidal fibro-cartilage is at- 

 tached by three fibrous bands passing on each side to the 

 OS sufFraginis. ; 



Synovial Membrane. 



This is supported in front by the extensor tendon, laterally by 

 lateral ligaments, and posteriorly by the glenoid fibro-car- 

 tilage, above which it forms a pouch behind the lower end 

 of the OS suffraginis. 



Movements. 



Similar to the fetlock. 



COFFIN JOINT. 



*■ 



(distal interphalangeal. ) 



1. Antero-Iatera' . —These Y)^^8 from the sides of the distal ex- 



tremity of the OS corona to depressions on each side of the 

 pyramidal process of the os pedis. 



2. Posterolateral. — These are the downward continuation of 



the lateral ligaments of the pastern. Each is attached to 

 the upper border of the navicular bone, and sends slips to 

 tie wing of the os pedis and the lateral cartilage. 



3. Interosseous. — Composed of short fibres passing from the in- 



ferior border of the navicular bone to the tendinous sur- 

 face of the OS pedis behind the semilunar crest. 

 Synovial Membrane. 



Related in front to the extensor pedis tendon (broad ligament), 

 and laterally to the lateral ligaments, between which it 

 protrudes, reaching the inner surface of the lateral cartil- 

 age. Another pouch passes upwards between the navicu- 

 lar bone and the os coron?p. 



Movements. 



Flexion and extension. 



A^'ote. — As described above, the postero-lateral includes the 

 })road ligament and lateral navicular ligaments of Strange- 



