560 



BLOOD-VASCULAR SYSTEM OF THE HORSE 



It is accompanied by the median nerve, which lies in front of the artery at its 

 origin, then crosses over it ol)hquely at the elbow joint and becomes posterior. In 

 the arm the brachial vein lies behind and partly upon the artery; lower down there 



Deltoid 



Mastoido-humeralu 



External head of 



triceps (cut) 



Cutaneous branch v. 



axillary ner;v 



Anterior radial artery 



Anterior extenso) 



Brachiah s 



Extensor carpi radiali. 



Extensor carpi ohliquns 



Tendon of extensor carpi radialis 



Ext. lateral lig. of carpus 



Rete carpi dorsale 



Tendon of ant. extensor 



Branrli to lateral extensor 



Tensor fasciae antibrachii 

 Long head of triceps 



Branch of radial nerve to ext. and 

 int. heads of triceps and anconeus 

 Deep brachicd artery 



Radial nerve 



Long head of triceps 



Internal head of triceps 



Anconeus 



External head of triceps (cut off) 



Olecranon 



Ulnar head of deep flexor 



Cutaneous branch of tdnar nerve 



E.tternal lateral lig. of elbow 



Flexor carpi exteriius 



[cut and reflected) 



Interosseous artery 



Ulna 



Ulnar head of anterior extensor 



Deep flexor of digit 



Lateral extensor of digit 



Ulnar nerve and vein 



Flexor carpi externus 



Dorsed interosseous artery 

 Svperflcicd branch of ulnar nerve 



Carpal .sheath (opened) 

 Outer tendon of flex, carpi ext. 

 Acccs.sory carpal bone 

 Accessorio-nietacarpal ligaments 



Band from accessory carpal to 

 lateral e.vtensor tendon 



Lateral extensor tendon 



Fig. 443. — Dissection of Left Forearm of Horse, External Surface, (.\fter Schmaltz, .\tlas d. .A.nat. d. 



Pferdes.) 



are usually two satellite veins, anterior and posterior. The chief collateral branches 

 are as follows: 



1. Articular branches for the elbow joint. 



