EXTREMITIES. * 33 



iicial arch which unites tlie cubital artery with the 

 collateral of tlie cannon, forming then the sub-carpal 

 arch — tlie super-carpal arcli being formed by the anas- 

 tomosis of the collateral of the cannoji and the epicoiir/ 

 dyloid itself. Collateral branches : two posterior 

 interosseous-metacarpal or palmar, and two anterior or 

 dorsal. The posterior run on the inside of both small 

 metacarpal bones, anastomosing downwards with the 

 collateral of the cannon. The anterior runs on the 

 outside of both small metacarpal bones, and downwards 

 anastomoses also with branches of the collateral of the 

 cannon. 



Collateral artery of the cannon. — Passes under 

 the carpal arch downward on the internal side of the 

 flexor tendons to the fetlock, and ends in the digital 

 artery. Collateral branches are : 1 — to the epicondy- 

 loid artery to form the supracarpal arch; 2 — synovial, 

 tendinous^ and cutaneous ramuscules : 3 — branch to 

 the posterior interosseous of the metacarpal. 



Digital artery.— On each side of the fetlock joint 

 it runs down to the basilar process and terminates in the 

 ungueal plantar and preplantar arteries. Collateral 

 branches : 1 — articular to the fetlock ; 2 — branch to 

 the tissue of the ergot; 3 — the perpendicular artery 

 of Percivall, ramifying into anterior and posterior 

 branches ; 4 — the artery of the plantar cushion run- yj-- 



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