1032 



DISEASES OF THE METATARSUS. 



of the distension and then injects a \ per cent, alcoholic solution of 

 sublimate, to which decolorised tincture of iodine has been added. 

 Frick has several times withdrawn the fluid and then injected a 

 solution containing iodine 2 parts, iodide of potassium 5 parts, and 

 water 100 parts ; thereafter he has lightly fired the parts in lines. 

 Ee slates that the results varied, but were never bad. 



(b) Distension of the sheath of the extensor pedis tendon in front 



Fig. 550. — Internal surface of the horse's hock to show synovial sheaths, a, Tendon 

 sheath of flexor metatarsi muscle : b, tendon sheath under inner terminal tendon 

 of flexor metatarsi ; r, tendon sheath of flexor accessorius ; d, tendon sheath of 

 flexor perforans ; e, e', tendon sheath of flexor perforatus and gastrocnemius 

 muscles ; /. /'. distended synovial capsule of the true hock-joint. 



of the hock is very rare, while distension of the lateral extensor tendon 

 sheath at the upper extremity of the shank is very common. The 

 tendon of the peroneus muscle is provided, opposite the lower margin 

 of the hock -joint and on its outer aspect, with a small sheath, which, 

 when over-distended, forms an elastic swelling at the upper end of 

 the shank, varying from the size of a walnut to that of a man's fist. 

 The condition is oftenest seen in riding-horses, being caused by slipping 

 or wrenching when the animal is thrown on its haunches ; or by 



