SHOULDER SPRAIN. 



59 



toral muscles, nor of the flexor brachii, will the act of placing the 

 foot on the ground cause any special pain. Wherever the lameness 

 may be, the liorse will take a very short step to the front, and, on 

 being reined back, will be inclined to drag the foot along the 

 ground from more or less inability to raise it. In all cases, lifting 

 up the leg and drawing the limb forward with the hand will hurt 

 the horse ; for it will render tense the pectoral muscles and the 

 flexor brachii, and will extend the shoulder joint. In thus manipu- 



Cartilage at top of I 

 shoulder blade J 



Shoulder joint 

 Flexor brachii 



Elbow joint 



Fig. 31. — Muscles of the fore leg. {After Chauveau.) 



lating the limb restlessness should not be mistaken for soreness. 

 Both shoulders should, of course, be compared and any local heat, 

 swelling, or tenderness noted. Unrelieved sprain of the shoulder 

 will soon be followed by wasting of the muscles of the shoulder, but 

 not those of the fore-arm. In chronic lameness of the foot, all the 

 muscles of the limb will tend to equally waste away. Wasting of 

 the shoulder muscles will be made manifest by the increased 

 prominence given to the spine of the shoulder-blade, which is the 

 bony ridge that stands out at right angles to the outward surface 

 of that bone, and divides it into two parts. 



