54 LAMENESS IN THE HORSE. 



and perforatus glide, extends about four inches above the 

 joint, and runs down to the upper third of the metacarpal 

 bone ; when distended, a longish swelling above and below 

 the carpus on the outside or inside is seen. 



4. Wind-galls. — The metacarpal phalangeal sheath for 

 the gliding of the perforans and perforatus tendons begins 

 in the lower third of the metacarpus, extending down to the 

 plantar cushion. Below the fetlock this sheath is surrounded 

 by a strong, unyielding fibrous band ; when distended, which 

 is rare, a flat swelling is noticed. Distension of that part of 

 the sheath above the fetlock is characterized by two longish 

 swellings, one on either side of the perforans tendon, 

 extending up to the lower third of the metacarpal bone. In 

 the hind-leg this gall quite often becomes hard, the result 

 of chronic changes in the tendon and its sheath. 



5. Distension of the Sheath of the Extensor Suffraginis. — This 

 swelling appears three to four inches above the knee on the 

 outside of the fore-arm, running downwards, at times 

 involving the anterior face of the carpus. 



6. Distension of the Sheath of the Extensor Pedis. — This is 

 rare. The sheath begins six inches above the knee ; it runs 

 in the outer groove on the inferior extreuiity of the radius 

 over the knee joint to the upper part of the metacarpus. 



7. Distension of the Sheath of the Extensor Metacarpi Magnus. 

 — This sheath runs parallel with the one of the extensor 

 pedis, but does not reach quite as far above the knee, runs 

 +hrough the middle groove on the inferior extiemity of the 

 radius, ending at the lower row of carpal bones. 



8. Distension of the Sheath of the Extensor Metacarpi 

 Ohliquus. — This sheath begins on the outside, and three 

 inches above the knee, runs obliquely downward and inward 

 over the anterior face of the carpus, ending at the head of 



