23 THE VETERINARY SCIENCE 



with the lower extremity of the tibia, or thigh bone, and 

 forms a true articulation of the hock joint. This part is what 

 gives most of the motion to the joint. Below these are three 

 other small, flat bones, placed one upon the other, having 

 articular surfaces between them. These are called the Cunei- 

 form bones of the hock. Immediately behind these three 

 small bones is what is termed the cuboid bone. This bone 

 also articulates with the cuneiform bones, helping to form 

 the articular surface of the hock. The lower articular sur- 

 faces help to give a small amount of motion to the joint. 

 This joint is the seat of the disease termed spavin. 



12. Fetlock, Pastern and Coffin Joints are similar to 

 those in front leg. 



