MUSCLES OF THE FOREARM AND MANUS 353 
The extensor tendons are bound down at the carpus by an annular ligament, 
and are furnished with synovial sheaths (Figs. 307, 308). 
B. Fiexor Division 
The three flexors of the carpus are like those of the horse, but the long tendon 
of the lateral flexor ends on the large metacarpal bone, not on the small one. The 
tendon of the medial flexor naturally ends on the medial part of the large meta- 
carpal bone. 
The superficial digital flexor is somewhat blended at its origin with the middle 
flexor of the carpus. It divides into two bellies, superficial and deep, terminating 
Fic. 307.—Ricatr Carpus oF Ox witH Burs# AND Fre. 308.—Ricutr Carpus oF Ox witk Burs® AND 
Synovial SHEATHS INJEcTED; LATERAL VIEW. SyNoviaL SHEATHS INJECTED; MEDIAL View. 
1, Extensor carpi radialis, with synovial sheath (7’) and bursa (1); 2, extensor carpi obliquus, with synovial 
sheath (2’) and bursa (2”); 3, extensor digiti tertii proprius; 4, extensor digitalis communis; 3’, common synovial 
sheath of 3 and 4; 5, extensor digiti quarti proprius, with synovial sheath (5’); 6, 6’, ulnaris lateralis, with bursa 
(6”); 7, flexor carpi radialis, with synovial sheath; 8, deep digital flexor, with synovial sheath (8’); 9, flexor carpi 
ulnaris; 10, superficial digital flexor, with synovial sheath, 10’; a, radius; b, carpus; c, metacarpus; d, cut edge of 
annular ligament. (After Schmidtchen.) 
on tendons at the distal part of the forearm. The superficial tendon passes over 
the posterior annular ligament (Lig. carpi transversum), perforates the metacarpal 
fascia, and joins the deep tendon about the middle of the metacarpus. The deep 
belly is connected with the deep flexor by a strong fibrous band. Its tendon passes 
under the annular ligament of the carpus in a groove on the deep flexor, from which 
it receives fibers. The conjoined tendon soon bifureates, each branch receiving a 
reinforcing band from the suspensory ligament, and forming near the fetlock a 
ring for the corresponding branch of the deep flexor tendon. Passing under two 
digital annular ligaments, they are inserted into the volar surfaces of the second 
ene by three slips. 
