236 MANUAL OF MODERN FARRIERY. 



w. This is the extensor of the leg ; it is the principal one of the 

 fore arm, is of considerable bulk, and occupies the front part 

 of the arm. It takes its rise from the lower portion of the 

 body of the lower bone of the shoulder, and from its outer 

 head. As it descends down the arm, it becomes tendinous. 

 This tendon passes under one of the ligaments of the knee ; 

 it then spreads out, and is inseited into the fore and superior 

 portion of the shank-bone. It is also seen at e, fig. 2. 



X. The middle flexor, or bending muscle of the shank-bone. 

 This is situated immediately on the middle of the back part of 

 the arm. It arises from the inner termination of the lower 

 bone of the shoulder, and is continued and inserted into one of 

 the bones on the inner side of the knee. It is also seen at e, 

 fig. 2. 



2. The external flexor of the leg, and which is situated on the 

 outer side of the arm, towards the back. It has its origin in 

 the outer head of the lower bone of the shoulder, stretching 

 towards the knee. It is of a tendinous character, and divides 

 into two portions, one of which is inserted into the same bone 

 of the knee, and the other into the outer small bone of the leg. 



3, And extending down to 7, 4, and 5, are the principal artery, 

 nerve, and vein of the leg. 



7. This is the perforated flexor muscle. It arises from the lower 

 and back portion of the inner head of the lower bone of the 

 shoulder, and is intimately intermixed with the 'perforating 

 flexor muscle. As it descends along the bone of the arm, it 

 becomes tendinous, and extending to the knee, it is bound 

 down by ligamentary bands to prevent it from starting in sud- 

 den or violent motion. From the knee it widens and partly 

 laps round the tendon of the perforating muscle ; they then 

 descend together in contact, but are V<)t adherent, sliding over 

 each other freely and safely by the aid of the lubricating fluid. 

 They are both encircled in a thick sheath of cellular substance, 

 which is attached to them by numerous small fibres. Reach- 

 ing near to the fetlock, the tendon expands still more, forming 

 a complete ring round the tendon of the perforating muscle. 

 This is shown at k, plate vi. fig. 7. The perforated tendon 

 soon divides, and is inserted into the larger and smaller pastern- 

 bones, its office being to bend them. 



8. The subcutaneous vein of the side of the chest. 



