70 



EQUINE ANATOMY. 



Fig. 7. 



OBLIQUE EXTENSOR OF METACARPUS. 



Origin. — External surface of ra- 

 dius. 



Insertion. — Head of internal me- 

 tacarpal with internal lateral liga- 

 ment. 



Action. — Extends metacarpus and 

 rotates them outward. 



Nerve. — Radial. 



ANTERIOR EXTENSOR OF PHALANGES. 



Origin. — Below crest of furrow 

 of torsion, of humerus, and in front 

 of its inferior extremity; the ex- 

 ternal lateral ligament of elbow and 

 external tuberosity and border of 

 radius. 



Insertion. — Pyramidal eminence 

 of third phalanx, capsular hgament 

 of fedock-joint and anterior surfaces 

 of first and second phalanges. 



Action. — As name implies. 



Nerve. — Radial. 



Fig. 7. 



-External muscles of the right 

 anterior limb. 



I, Long abductor of the arm: i', Its humeral in- 

 sertion; 2, Superspinatus; 3, Subspinatus; 

 3', Its tendon of insertion ; 4, Short abductor of 

 the arm; 5, Biceps; 6, Anterior brachialis; 7, 

 Large extensor of the forearm; 8, Short exten- 

 sor of the forearm; q, Anconeus; 11, Anterior 

 extensor of the metacarpus; 11', Its tendon; 

 12, Aponeurosis separating that muscle from 

 the anterior brachialis; 13, Oblique extensor 

 of the metacarpus; 14, Anterior extensor of 

 the phalanges; 14', Its principal tendon; 15, 

 The small tendinous branch it furnishes to the 

 lateral extensor; 16, Lateral extensor of the 

 phalanges; 16', Its tendon; 17, The fibrous 

 band it receives from the carpus; 18, External 

 flexor of the metacarpus; 19, Its metacarpal 

 tendon; 20, Its supracarpal tendon; 21, Ulnar 

 portion of the perforans; 2-% Tendon of the 

 perforans; 23, Its carpal ligament; 24, Its 

 reinforcing phalangeal sheath; 25, Tendon of 

 the perforatus. 



