560 



BLOOD-VASCULAR SYSTEM OF THE HORSE 



It is accompanied by the median nerve, which Hes 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 behintl and partly upon the artery; lower down there 



Deltoid 



Mastoido-h umerah 



External head < 



triceps (cu 



Cutaneous branch of 



axillanj neiu 



Anterior radial aitaij 



Anterior extenbO) 



Brachiali 



Extensor carpi radiali6 



Extensor carpi obliquus 



Tendon of extensor carpi radialis 



Ext. lateral tig. of carpus 



Rete carpi dorsale 



Tendon of ant. extensor 



Branch to lateral extensor 



Tensor fascia; antibrachii 

 Long head of triceps 



Branch of radial nerve to cxt. and 

 int. heads of triceps and anconeus 

 Deep brachial artery 



Radial nerve 



Lung head of triceps 



Internal head of triceps 



Anconeus 



External head of triceps {cut off) 



Olecranon 



Ulnar head of deep flexor 



Cutaneous branch of ulnar nerve 



External lateral lig. of elbow 



Flexor carpi externus 



{cut and reflected) 



I nterosseous artery 



Una 



rinar head of anterior extensor 



Deep flexor of digit 



Lateral extensor of digit 



I 'Inar nerve and vein 



Flexor carpi extermis 



Dorsal interosseous artery 

 Superficial brar^ch of ulnar nerve 



Carpal sheath {opened) 

 Outer tendon of flex, carpi ext. 

 Arces.sory carpal bone 

 . 1 ceessorio-nutacarpal ligaments 



Baud from acces.sori/ carpal to 

 lateral exten.sor tendon 



Lateral extensor tendon 



Fig. 443. — Dissection of Left Forearm of Horse, Em i k \i m hi ack. (After Schmaltz, Atla.s d. Anat. d. 



Pfenle.-^.) 



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

 are as follows: 



1. Articular branches for the elbow joint. 



