30 THE SURGICAL ANATOMY OF THE HORSE 



artery to the biceps muscle (29a), and disappears from view by 

 passing outwards with this vessel. It passes beneath the biceps and 

 divides into two parts, one of which is distributed to the brachialis 

 anticus muscle, and the other descends superficially on the inner 

 aspect of the forearm, in the aponeurotic covering of which it is 

 expended. 



The Internal Plantar Nerve (50). — This nerve is first observed 

 where it leaves the carpal sheath, on the inner edge of the perforans 

 tendon. It runs down the edge of this tendon behind the large 

 metacarpal artery ; about half-way down the metacarpal region it 

 gives off a branch (56) which winds round the back or the limb 

 behind the tendon of the superficial flexor of the digit to gain the 

 outer side, where it joins the external plantar nerve just above the 

 level of the button of the splint bone. 



The nerve continues its course down the limb behind the 

 internal digital artery, and its subsequent course and distribution 

 resemble those of the external plantar nerve. 



