22 NAMES OF EXTERNAL PARTS AND DEFINITIONS. 



Knee (6). — The upper boundary of the knee may be 

 regarded as a line drawn at right angles to the direction of 

 the leg, above the knee joint, and just clear of the bony pro- 

 minence that is on the side of the knee. The lower boundary 

 of the knee may be taken as a line joining the point where 

 the line of the cannon-bone meets that of the knee, with that 

 where the line of the back tendons is terminated by the bone 

 (the trapezium, /) which is at the back of the knee. 



The Cannon (7). — A suitable designation for the part 

 of the leof which is situated between the knee and fetlock is 

 much required. The term " cannon " is apt to give one the 

 impression that only the cannon-bone is meant : it would be 

 more convenient if the back tendons and suspensory ligament 

 were also included. The line dividing the cannon from the 

 fetlock is one drawn across the leg immediately above the 

 prominence caused by the fetlock joint. 



The back tendons i^ni) or bjck sinews are the fibrous cord 

 which runs down the back of the lee between the knee and 

 the fetlock. This cord consists of two tendons which lie 

 closely together. 



The suspensory ligament is a fibrous cord which lies 

 between the cannon-bone and the back tendons, and which 

 can be seen in a well-formed leg that is not unduly covered 

 with hair {vide PI. 42). 



The cannon-bone (j) is the bone which lies between the 

 knee and the fetlock. It has two small bones (outside and 

 inside splint bone) at its back. 



Fetlock (8). — The fetlock joint is the joint which the 

 cannon-bone makes with the pastern. The term fetlock 



