ANTERIOR TIBIAL GROUP. 247 



EXTENSOR PEDIS. 



{Femoro-pi'ephalcmgeus.) 



(Fig. 85. I.) 



Situated on the anterior surface of tlae tibia and bones below 

 this is a long^ fusiform muscle, extending downwards and back- 

 wards. A little above the tarsus, the belly terminates in a long, 

 flat tendon, which, bound down by the three bands of the annular 

 ligament, passes down the front of the tarsus and metatarsus, 

 near the middle of which it receives the extensor brevis and the 

 tendon of the peroneus ; the united tendon now passes down, and 

 is arranged like that of the anterior limb. 



Origin. — From the fossa between the trochlea and external 

 condyle of the femur, by the tendon of the flexor metatarsi, 

 common to it. 



Insertion. — To the capsular ligament of the fetlock joint, the 

 anterior surface of the two first phalanges, and the pyramidal 

 process of the os pedis. 



Relation. — Anteriorly with the fascia; internally with the 

 flexor metatarsi ; posteriorly with the peroneus. 



Action. — To extend the entire digit, and flex the tarsal joint. 



p-ERONEUS. 



{Peroneo-prephalangeus. ) 



(Fig. 85. c.) 



Situated on the external side of the leg, this is a long and 

 somewhat penniform muscle, consisting of a prismatic, fleshy belly, 

 which originates by a short, and terminates by a long tendon ; 

 the latter passes through a theca on the external side of the 

 tarsus, joining the tendon of the extensor pedis below the joint. 



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

 and the entire length of the fibula. 



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



Relation. — Externally with the fascia; anteriorly with the 

 extensor pedis ; posteriorly with the flexor pedis perforans. 



Action. — It assists the extensor pedis. 



