INNER ASPECT OF LIMB 25 



wards in the groove between the large and the inner small metacarpal 

 bones. 



The Internal Digital Artery (58). — As already stated, this results from 

 the division of the large metacarpal artery above the fetlock. It 

 descends across the fetlock in front of the internal plantar nerve and 

 behind the internal digital vein. It then follows the course of the 

 posterior digital nerve, in front of which it is placed, and with which it 

 descends to the lateral cartilage. Here the artery disappears from view 

 to gain the deep face of the cartilage, where it divides into the preplantar 

 and plantar arteries. 



The Perpendicular Artery of the Pastern. — This vessel corresponds in 

 its origin, course, and distribution to the perpendicular branch of the 

 external digital artery already described. 



The Veins 



The Internal Digital Vein (sj)- — This vessel is formed by the union 

 of the small veins which drain the plexuses on the inner aspect of the 

 foot. It takes a course up the limb, similar to that taken by the external 

 digital vein, and disappears above the fetlock to contribute to the 

 formation of the venous arch already described. 



The Internal Metacarpal Vein (45). — This vessel first makes its appear- 

 ance in front of the large metacarpal artery and runs up the Hmb. It 

 takes a slight forward inclination, and is then directed upwards across 

 the inner aspect of the knee, where it is found in front of the small 

 metacarpal artery. Here the vein becomes directly continued as the 

 internal subcutaneous vein of the forearm or median vein. In the plate 

 the vein seems to terminate abruptly. This is because the median vein 

 has been removed, since it is at a more superficial plane than the parts 

 represented in the forearm. 



The Posterior Radial Vein (33). — This makes its appearance between 

 the inner edge of the radius and the flexor metacarpi internus muscle. 



