LIGAMENTS AND MUSCLES OF THE HORSE. 23 



4. Astragal 0-metatarsal. - Attached above to a tubercle on the 



inner side of the astragalus, and, widening below, is attached 

 to the cuneiform magnum and medium, and large metatar- 

 sal bones. 



5. Tarso-metatarsal. - Is a thick mass of fibrous tissue covering 



the posterior surface of the hock, blending inwardly with 



the lateral ligament, outwardly with the calcaneo-cuboid 



ligament. 



Below, it is continued to form the check-ligament. 



6. Calcaneo-cuboid (or C alcaiieo-metatarsal). —Atta^ched to the 



posterior border of the oscalcis, the cuboid, and the outer 

 small metatarsal. 

 J^ote. This ligament is affected in curb. 



Synovial Membranes. 



These are three in number. The first (and most important) 

 lubricates the joint between the tibia and astragalus. It 

 is supported by the anterior, posterior, and lateral liga- 

 ments. When distended (as in bog-spavin), it causes the 

 anterior ligament to bulge out at the antero-intemal part 

 of the joint. 



The second lubricates the joint between the astragalus and 

 OS calcis above, and the cuneiform magnum and cuboid 

 below. It has prolongations above, in front, and below. 

 The third supplies the joint formed between the cuboid, 

 cuneiform medium and parvum aV)Ove, and the three meta- 

 tarsals below. It descends to supply the facets of the 

 large and small metatarsals. 



Movements. 



Flexion and extension. 



]\Tofe. — For a detailed description of the synovial apparatus, the 

 student is referred to Chauveau. 



