54 LIGAMENTS AND MUSCLES OF THE HORSE. 



it is joined by the tendon of the peroneus, and by the ex- 

 tensor pedis brevis A small synovial bursa is interposed 

 between the tendon and the anterior ligament of the fet- 

 lock. About the middle of the os suffraginis, it is joined 

 by the branches of the suspensory ligament. 



2. Peroneus. 



Origin. — From the external lateral ligament of the stifle, and 



from the fibula. 

 Insertion. — It joins the tendon of the extensor pedis below the 



hock . 

 Action. - To assist the extensor pedis. 



3. Flexor Metatarsi. 



Oriyin. — 



[a) Tendinous j^ortion. — From the pit between the external 



condyle and trochlea of the femur. 

 (5) Fleshy j)ortio7i. — From the supero-external surface of the 



tibia. 

 Insertio7i. — 

 {a) To the upper extremity of the large metatarsal, and to the 



cuboid. 

 (h) To the upper extremity of the large metatarsal and to the 



cuneiform parvum. 

 Action. — To flex the hock. In this, the tendinous portion acts 



only mechanically, flexing the hock when the stifle is flexed. 

 Note. — At the front of the hock, the tendinous portion is per- 

 forated for the passage of the tendon of the muscular 



portion. 



POSTERIOR TIBIAL REGION. 



1. Gastrocneinius (externus). 



2. Flexor pedis perforatus (gastrocnemius internus). 



3. Soleus (Plantaris). 5. Flexor pedis perforans. 



4. Foplitens. 6 Flexor pedis accessorius. 



