THE IIIXD EXTREMITY. 2G9 



inserted into a groove between the outer condyle and outer 

 ridge of the femur. 



Flexor pedis perforans also arises from the posterior 

 surface of the tibia, but is externally placed, being also 

 attached to the posterior margin of the fibula ; it becomes 

 tendinous above the hock, passes over the concave internal 

 surface of os calcis, where it is lubricated with synovia ; 

 opposite the superior third of the large metatarsal bone 

 receives the tendon of flexor pedis accessorius and the 

 subtarsal ligament, which is not so strong as the sub- 

 carpal. Below this it comports itself in a manner corre- 

 sponding to the similar tendon of the fore limb. 



Flexor pedis accessorius arises from the posterior surface 

 of the tibia, between the attachments of popliteus and the 

 perforans ; it becomes tendinous oj^posite the inferior third, 

 and passes through a groove situated just behind the inner 

 malleolus of the tibia, where it is bound down by a con- 

 tinuation of the posterior annular ligament, and lubricated 

 with synovia, having a sheath which extends obliquely 

 downwards and backwards over the lateral part of the 

 hock. It terminates in becoming blended with perforans, 

 opposite the superior third of the large metatarsal bone. 

 On the external surface of the limb we see three muscles. 



Peroneus arises from the outer surface of the fibula, 

 being continuous superiorly with the outer lateral ligament 

 of the stifle-joint. Its fibres converge in a bipenniform 

 manner to form a small tendon, which passes through the 

 groove found on the external malleolus of the tibia. It is 

 here lubricated by synovia, and, enclosed in a synovial 

 sheath, passes within the annular ligament in an oblique 

 direction forwards, joining extensor pedis tendon with 

 extensor pedis accessorius at the inferior part of the 

 superior third of the large metatarsal bone. 



Flexor metatarsi arises by a round tendon common to 

 it and to extensor pedis from the depression between the 

 outer condyle and the outer ridge of the femur. This 

 tendon, after becoming attached to the capsular ligament, 

 passes in the groove between the spine of the tibia and the 

 head of the fibula, where it plays over a synovial bursa ; 

 it then gives off extensor pedis, and receives numerous 

 muscular fibres from their attachment in the external 

 channel of the tibia. The tendon, however, continues as a 

 white fibrous band to the front of the hock, where it breaks 



