502 



SPATIN. 



in consequence, is the production 

 of that well known disease, 

 Spavin. 



If the joints of the hind limbs 

 are examined, and carefully com- 

 pared with one another, it will be 

 seen that the greatest extent and 

 freedom of motion (of any of these 

 joints) will occur in the hocks ; 

 and also that the motion in the 

 latter will be principally affected 

 between the tibia h and the 

 astragalus g ; whUe the small 

 bones d efc h, situate below the 

 astragalus, will act during the 

 locomotion of the animal, as a 

 series of buffers. Now it is 

 amongst these bbnes, d e f e b 

 upon the inside of the joint, that 

 the disease in question — viz., 

 Spavin — is always located. 



Sometimes it commences be- 

 tween the under surface of the 

 cuneiform parvum (the bone f) 

 and the head of the inner splint 

 bone 5 ; in which case the Spavin 

 is called, by dealers and horse- 

 men in general, "a Jack." In 

 other cases, again, the disease 

 coinmenees higher in the joint, or 

 between the under surface of the 

 cuneiform magnum d e, and the 



Fig. 30. 



A reprenentaUon of the hock jomt, 

 pwrtly diagramatiCf ehowmg the wr- 

 rwngement of the hones of the orga/R, 



a The cannon tone. 

 6 The inner splint hone. 

 c The cimeif onn medium. 

 / The cimeiform parvum. 

 d e The cuneiform magnum. 

 ff The Astragalus, or puUey- 

 Kke bone. 



h The tibia. The motion of 

 the joint is effected between these 

 two bones grand A. The lower end 

 of the bone h fits closely to the 

 bone g, which is provided with 

 deep grooves, into which the 

 .• lower extremity of the bone h is 

 securely fixed. 



i The OS claois, or the bone 

 whicli forms the back prominence 

 of the hook. 



