46 LIGAMENTS AND MUSCLES OF THE HORSE. 



the carpus, the tendons are bound down by the annular 

 ligament, and invested with a synovial sheath. A syno- 

 vial bursa is also found at the fetlock. At the middle of 

 the first phalanx, the branches of the suspensory ligament 

 join the tendon. 



4. Extensor Suffraginis. 



Origin. — From the external tuberosity and outer border of the 



radius ; also from the external lateral ligament and the 



ulna. 

 Insertion. — To the supero-anterior part of the os suffraginis. 

 Actio7i. — It extends the digit. 

 Note. — Two slips reinforce the tendon, one from the extensor 



pedis, the other from the outer side of the carpus. Where 



the tendon plays over the fetlock, a small bursa is intei'- 



posed. 



POSTERIOR ANTIBRACHIAL REGION. 



1. Flexor melacar pi externus. 5. Flexor pedis perf or ans. 



2. Flexor metacarpi medius. 6. Ulnaris accessor ius. 



3. Flexor metacarpi internus. 7. Radicdis accessorius. 



4. Flexor pedis iperf or atus. 



1. Flexor Metacarpi Externus. 



Origin. —From the external condyle of the humerus. 

 Insertion. ~^y two tendons ; one to the trapezium, the other to 



the head of the outer small metacarpal. 

 Action. — To flex the knee. 



2. Flexor Metacarpi Medius. 



Origin. — From the internal condyle of the humerus, and from 



the olecranon. 

 Insertion. — To the trapezium. 

 Action. — Same as preceding. 



3. Flexor Metacarpi Internus. 



Origin. — From the internal condyle of the humerus. 



