88 



EQUINE ANATOMY. 



" A 



COMMON INTEROSSEOUS OF METACARPUS. 



Given off at inner side of, and descends be- 

 hind, the carpus to the head of internal meta- 

 carpal, then passes outward, anastomosing with 

 a descending branch from arch above between 

 ulnar and common arteries, forming the sub- 

 carpal arch. That above is the supra-carpal 

 arch. 



Branches. 



Two posterior interosseous, arising at heads of 

 metacarpus, pass downward, ending at the 

 lower ends of metacarpus, anastomosing with 

 the collateral of the cannon, and giving off 

 branches to the suspensory ligament, skin and 

 tendons. 



Two anterior interosseous, arising with pre- 

 ceding, curve around heads of bones, become 

 anterior, pass downward, anastomose with 

 artery of cannon, and send branches to tendons 

 and skin. 



COLLATERAL ARTERY OF CANNON. 



Passes under carpal sheath to inner side of 

 flexor tendons, with internal plantar nerve, to 

 top of great sesamoid bones, where it divides 

 into the digital arteries. 



FIG. ii, ARTERIES OF THE FORE-FOOT, SEEN FROM BEHIND. 



The muscles and tendons have been removed, only a small 

 portion of the perforans tendon being left; the os pedis 

 has been chiseled away on its plantar face to expose the 

 semilunar anastomosis. 



i, Posterior radial artery; 2, Innominate carpal branch; 3, 

 Supra-carpal arch; 4, Epicondyloid (ulnar) artery; 5, 

 Radio-palmar artery, or common trunk of the interosse- 

 ous metacarpal arteries; 6, Sub-carpal arch; 7, 7, Poste- 

 rior interosseous meta-carpal arteries; 7', /, Anterior 

 interosseous metacarpal arteries; 8, 8, Their origin; 9, 

 Collateral artery of the cannon; 10, Its communicating 

 branch with the interosseous arteries; n, n. Digital arte- 

 ries; 12, Semilunar anastomosis in the os pedis; 13, Emerg- 

 ent branches of this anastomosis; 14, Plantar ungueal 

 artery, forming this anastomotic arch; 15, Origin of the 

 preplantar ungueal artery; 16, Origin of the plantar- 

 cushion artery; 17, Origin of the anterior branch of the 

 coronary circle; 18, Posterior branch of the same. 



