EXTREMITIES. 39 



artery, there anastomoses with tlie anterior brachial 

 nerve, phices itself in front of tlie 1 mineral artery, run- 

 ning with it to its terminal bifurcation, passes down- 

 wards on the inside of the leg with the posterior ra- 

 dial artery, arrives at the elbow joint, becomes poste- 

 rior, and a])ove the inferior third of the fore-arm bifur- 

 cates to form the plantar nerve. Collateral branches : 

 1. One branch to the thoracic nerve going to the super- 

 ficial pectoral muscles. 2. In the middle of the 

 humerus, one branch wdiich passes beneath the coraco- 

 brachialis and terminates in two small branches. 3. 

 In the antibrachial region, branches to the internal 

 flexor of the metacarpal and to the flexors of the pha- 

 langes. 



Plantar nerve. — External and internal. Internal 

 lies beside the collateral artery of the cannon, alons^- 

 side the perforans tendon to near the fetlock, where 

 it terminates by several digital branches. Collat- 

 eral branches to the skin of the metacarpal region, 

 and one which crosses obliquely behind the flexor ten- 

 dons and unites with the external plantar nerve. Ex- 

 ternal plantar nerve is formed by a branch from the 

 cubital and one from tlie median nerve, runs in com 

 pany with the external collateral vein of the cannon 

 and an arteriole, outside of the flexor tendons at the 

 superior extremity of the cannon, inside of the head 



