THE LIMBS OF THE HORSE 



67 



relation. Enumerated from behind forwards, these structures are as 

 follows : — The volar ramus of the volar metacarpal nerve ; the digital 

 artery ; the dorsal ramus of the nerve ; the digital vein ; a branch 

 of the dorsal ramus of the nerve. 



In the consideration of this region from the surgical point of 

 view it is also necessary to remember that the volar and dorsal rami 

 of each nerve are connected by anastomotic filaments, with the 



Scapula. Coracoid process. Origin of m. biceps brachii. 



, M. supraspinous. 



Greater tubercle of 

 humerus. 



M. biceps brachii. 



Crest of greater 

 tubercle. 



Deltoid tuberosity 



Insertions of m. infraspinatus 



Joint capsule 



M. capsularis. 



Humerus 



Fig. 46. — Lateral Aspect of the Shoulder Joint. 



The red line indicates the extent of the synovial bursa between the 

 lateral tendon of insertion of m. infraspinatus and the convex area 

 of the greater tubercle of the humerus. 



result that their areas of distribution are ill-defined and overlap 

 each other. This confusion of territory is, however, more pronounced 

 in front of the digit than behind; so that division of the volar 

 ramus destroys sensation in the more volar structures contained 

 within the hoof. 



Dissection. — The dissector must now examine the articulations of the 

 limb, with the exception of those between the three phalanges of the 

 digit which will be dissected in connection with the contents of 

 the hoof. 



The shoulder joint (articulatio humeri). — The bony surfaces 

 entering into the formation of the shoulder joint are the glenoid 

 cavity of the scapula and the head of the humerus. It is note- 

 worthy that the glenoid cavity has scarcely more than half the area 

 of the humeral head. 



