THE LIMB IN SECTION 33 



perforatus is embraced by the anterior surface of another tendon, 

 which is here somewhat crescentic in outline. This is the tendon of 

 the gastrocnemius muscle, which is inserted into the depression at the 

 summit of the tuber calcis. 



A short distance lower down the limb than the plane of section 

 the tendon of the flexor perforatus winds round the inner side of that 

 of the gastrocnemius and becomes placed behind it to play over the 

 summit of the tuber calcis, and pass down the limb in the manner 

 already described. 



In Plate IX. we have a representation of a longitudinal antero-pos- 

 terior section of the hock of the left limb. In the upper half there is, 

 shown slightly in front of the middle of the Plate, the inferior third of 

 the tibia, and it will be observed that the antero-posterior dimension 

 of the bone increases progressively from the upper end of the portion 

 represented, to its inferior extremity. Lying on the front of the bone, 

 and in intimate relationship to it, is the muscular division of the flexor 

 metatarsi, and in front of that, again, is the superficial or tendinous 

 portion of this muscle. Anteriorly, at the upper extremity of the Plate, 

 is a small portion of the inferior end of the belly of the extensor pedis. 

 This is followed by a tendon, which plays beneath the uppermost of the 

 three annular fibrous bands. This band is plainly seen in section. 



Lying on the back of the tibia superiorly is the flexor perforans 

 muscle. This will be observed to be succeeded by a tendon which 

 plays through the tarsal sheath above and behind the body of the calcis, 

 and to the inner side of the tuber. The tendon is, however, separated 

 from the inferior extremity of the bone by the posterior common 

 ligament of the true hock joint {i.e., the joint between the tibia and the 

 astragalus) which is plainly represented, and which it will be noticed 

 separates the synovial capsule of the true hock joint from the tarsal 

 sheath. 



Behind the muscular portion of the flexor perforans there is 

 a quantity of adipose and areolar tissue, and still more posteriorly is 



